Trade, aid and tourism

Visible trade: what moves, between whom, and along which routes

Visible trade is the movement of physical goods across a border - anything that can be weighed, counted and loaded into a container. What it leaves out matters just as much, because invisible trade is the trade in services: tourism, shipping, insurance, banking, and now software and data. Countries such as the United Kingdom, Greece, the Philippines and Thailand earn a large share of their foreign currency invisibly, and the syllabus treats tourism as an invisible export for the destination country. Nearly every country does both, but the balance between them, and the kind of goods it sells, tells you a great deal about its economy.

By value, world merchandise trade is dominated by manufactured goods: machinery, vehicles, electronics, chemicals, clothing and the components that go into them. A modern product is rarely made in one country. A phone may be designed in the United States, use chips from Taiwan and the Republic of Korea, a screen from Japan, and be assembled in China or Vietnam, so the same component crosses several borders before it becomes a finished product. That is why a large part of the trade between high-income countries is trade in parts rather than in finished goods, and why a tariff on a component raises the cost of the finished product several times over.

Between types of countries the pattern is still unequal. High-income countries trade mainly with each other and with the largest emerging economies, and they sell manufactures and services. Many low-income countries sell one or two primary commodities - crude oil, copper, cocoa, coffee, cotton, cut flowers - and buy manufactures, fuel and machinery in return. The big change of the last forty years is the rise of the newly emerging economies (NEEs): China, Vietnam, Bangladesh, India, Mexico and Indonesia now export manufactures on a very large scale, and China is the largest trading partner of most countries in Africa and South America.

Trade blocs concentrate trade between their members. Inside the European Union goods move without tariffs or customs checks and one set of product rules applies to all members; USMCA links the United States, Canada and Mexico; ASEAN links the economies of South-East Asia; Mercosur links Brazil, Argentina, Uruguay and Paraguay; the African Continental Free Trade Area is gradually cutting tariffs across most of Africa; and RCEP covers much of Asia and the Pacific. Because members trade with each other on better terms than with outsiders, a bloc pulls trade towards its own members and can pull it away from more efficient producers outside, which is why the barrier a bloc sets for outsiders matters as much as the tariffs it removes inside.

Major trade routes follow the cheapest line between producers and markets, and most long-distance goods still travel by sea. The busiest container routes run from East Asia to Europe through the Strait of Malacca and the Suez Canal, and across the Pacific to North America; oil and gas move from the Gulf through the Strait of Hormuz and the Bab el-Mandeb; iron ore and coal run from Australia and Brazil to China; and the Panama Canal carries traffic between the Atlantic and the Pacific. Each of these is a chokepoint, and a blockage there is felt everywhere: a container ship grounding in the Suez Canal in 2021, and attacks on shipping in the Red Sea from late 2023, both pushed ships onto longer routes and raised freight costs and delivery times.

The pattern that matters most is the gap between volume and value. A country can export an enormous tonnage of one commodity and earn very little, while another exports a small weight of manufactures and earns far more per tonne. Iron ore, bauxite and crude oil are bulky and cheap per tonne; a machine tool or a packet of medicine is light and expensive. This is why the money in world trade is concentrated in a small number of economies, and why the exports of many poorer countries look small in value even when the ships leaving their ports are full.

• Visible trade is goods; invisible trade is services - tourism, transport, insurance, finance, software. Tourism is an invisible export for the destination.
• Most trade by value is in manufactured goods, and much of it is components moving between factories rather than finished products.
• Most low-income countries export primary commodities and import manufactures; most high-income countries do the opposite, and the NEEs now do both.
• Trade blocs: EU, USMCA, ASEAN, Mercosur, AfCFTA, RCEP. Members trade more with each other because internal tariffs and rules are removed.
• Chokepoints: Malacca, Suez, Hormuz, Bab el-Mandeb, Panama. A closure raises freight costs and delivery times worldwide.
• Inequality is in value as well as volume: bulky commodities earn little per tonne, manufactures earn a great deal.

Physical and historical factors: position, resources and the colonial legacy

Geographical location decides much of a country's trading opportunity before any policy is written. A deep, sheltered, ice-free harbour on a busy shipping lane, with a rich and crowded hinterland behind it, becomes a transhipment hub almost by geography: Singapore sits at the southern end of the Strait of Malacca, Rotterdam at the mouth of the Rhine with the industrial heart of Europe behind it, and Dubai on the Gulf routes between Asia, Africa and Europe. A landlocked country pays for every kilometre of somebody else's railway and port, which is why Zambia must send its copper out through Tanzania or South Africa and why transport is a permanent tax on its exports.

Resource endowment is the second physical factor: what a country has in its ground and its climate. The Gulf states hold the largest reserves of crude oil and gas; Zambia, the Democratic Republic of the Congo and Chile have copper, and the Congo also supplies most of the world's cobalt; Australia and Brazil have iron ore; Cote d'Ivoire and Ghana grow much of the world's cocoa; Ethiopia, Brazil and Colombia grow much of its coffee. Endowment sets the starting point, not the outcome: Japan, Switzerland and Singapore have almost no minerals and are among the world's largest traders, because they sell skills, capital and position instead.

Colonialism built the trade pattern that many countries still live with. Colonial economies were organised to supply the imperial power with raw materials and to buy its manufactures, so railways and roads ran from the mine or the plantation to the nearest port rather than between regions, ports were built for export rather than for local trade, and production was concentrated in the one or two crops or minerals the metropole wanted. The borders drawn at Berlin in 1884-85 and afterwards cut through kingdoms, trade routes and ethnic groups, leaving small, landlocked and sometimes resource-poor states, and the currency, legal, language and shipping links of empire went on pointing trade at the former ruler after independence.

The ongoing influence shows in three ways. First, concentration: many post-colonial economies still earn most of their export income from one or two commodities - copper in Zambia, cocoa in Cote d'Ivoire, oil in Nigeria - so a single price fall can cut government revenue and foreign currency at a stroke. Second, direction: trade, finance, insurance and shipping links still often run to the former colonial power, and the CFA franc used in much of West and Central Africa is still pegged to the euro with French involvement in its management. Third, weak industrialisation: tariff escalation in the markets they sell into, and a shortage of capital, power and infrastructure at home, made it hard to move from exporting the raw material to processing and manufacturing it.

None of this is permanent. Kenya has built a fresh flower and vegetable trade to Europe on air freight; Malaysia moved from tin and rubber into palm oil, electronics and services; Mauritius moved from sugar into textiles, tourism and finance; Botswana used diamond revenue to build infrastructure and institutions; and the Republic of Korea, Taiwan and later Vietnam turned education, land reform and manufacturing policy into export-led growth. History sets the odds; it does not fix the result.

Economic and political factors: demand, logistics, trade blocs, protection and TNCs

Trade follows price, and price moves with supply and demand. When China's industrialisation accelerated from the 1990s, its demand for iron ore, copper, coal and oil lifted commodity prices and redirected bulk carriers towards Chinese ports, which is why Australia and Brazil became such large exporters. Demand can fall as fast as it rose: the Asian financial crisis of 1997-98, the global financial crisis of 2008-09 and the COVID-19 pandemic of 2020 each cut trade volumes, while Russia's full-scale invasion of Ukraine in 2022 raised energy, fertiliser and grain prices and re-routed gas and oil supplies across Europe. Supply moves too: a drought in Brazil, a strike at a Chilean copper mine or a decision by OPEC+ to cut output changes the price, and therefore the direction and volume of trade.

Developments in logistics have done more to shape modern trade than any trade agreement. Containerisation, from the late 1960s, put cargo into standard steel boxes that could move from factory to lorry to ship to train without being unpacked, cutting the cost of handling at a port from days of manual labour to hours of crane work. Cheap, reliable container shipping made it profitable to split production across countries, and the same principle applies to bulk carriers for ore and coal, LNG tankers for gas and air freight for goods with a high value-to-weight ratio - Kenyan flowers and vegetables, Chilean cherries, pharmaceuticals and electronics. ICT works alongside it: electronic customs and shipping documents, real-time tracking, just-in-time delivery so that a factory holds days rather than months of stock, online marketplaces that let a small firm in Hanoi sell directly to a buyer in Hamburg, and digital payment systems that cut the cost of getting paid across borders.

Trade also needs finance and infrastructure: credit to pay for goods that will not be sold for months, insurance against loss at sea, banks that can exchange currencies, and roads, ports, power and cold storage that work. A country with cheap labour but unreliable electricity, slow customs and expensive credit cannot compete, because the buyer's total cost includes the delay. Workforce structure and characteristics matter in the same practical way: the size and age of the labour force, literacy and technical skills, wage levels and labour rights decide which production a country can attract, which is why garment assembly moved from the Republic of Korea and Taiwan to Bangladesh, Vietnam, Cambodia and Ethiopia, and why automation is now pulling some of it back to higher-wage countries. The level of development ties these together: diversified, well-connected economies with educated workforces trade more and earn more per tonne than economies that depend on one commodity.

Trade blocs, agreements and protection set the rules within which all of this happens. A regional trade bloc removes tariffs and harmonises rules between members and applies a common barrier to outsiders, so trade concentrates inside it. A bilateral agreement does the same for two countries. Protectionist policies work in the other direction: tariffs raise the price of imports, quotas cap their quantity, subsidies make domestic producers cheaper, product standards and sanitary rules can keep out goods that cannot be certified, and export bans or sanctions stop trade altogether. The tariffs the United States and China imposed on each other from 2018 show how quickly a political decision can re-route supply chains, and the same is true of the sanctions imposed on Russia after 2022. Price setting is the other lever. Producer groups such as OPEC+ agree output quotas to support the oil price, and Cote d'Ivoire and Ghana add a fixed premium to their cocoa price to raise farmers' incomes. Commodity exchanges in London, Chicago and New York set the reference price for metals and grains, while a handful of supermarket chains and brand buyers can dictate the price and the standard to producers who have no other customer.

Transnational corporations (TNCs) are the organisations that put these pieces together. A TNC is a firm that owns or controls production in more than one country, and it builds a global production network by placing each stage of its production wherever costs, skills, taxes and access to markets are most favourable. Apple designs in California but its phones are assembled by contractors such as Foxconn in China and increasingly in India and Vietnam; clothing brands such as Nike, H&M and Inditex own few factories and buy from thousands of suppliers across Asia; car makers build plants in Mexico to sell into the United States. TNCs bring capital, technology, training and access to markets, and they also keep the most valuable stages - design, branding, finance, retail - in their home countries, which is why so much of the profit in a global production network is earned far from where the product is made. TNCs from NEEs now do the same: Tata of India, Huawei, BYD and Xiaomi of China, Embraer of Brazil, Cemex of Mexico and JBS of Brazil invest across borders, and Chinese firms in particular have become major investors in African mining, ports and railways.

• Supply and demand set commodity prices: Chinese industrialisation raised demand for ore and oil; crises in 1997-98, 2008-09 and 2020 cut trade; the war in Ukraine raised energy, grain and fertiliser prices.
• Containerisation cut port handling costs and made it profitable to split production across countries; air freight carries high value-to-weight goods.
• ICT cuts the cost of finding buyers, tracking shipments, clearing customs and getting paid.
• Finance and infrastructure decide whether cheap labour is actually competitive: credit, insurance, power, roads and fast customs all count.
• Workforce structure, skills and wage levels decide which production a country attracts, and automation is now reversing some of the labour-cost advantage.
• Blocs and agreements concentrate trade between members; protectionism - tariffs, quotas, subsidies, standards, export bans, sanctions - redirects or blocks it.
• Price setting happens on both sides: OPEC+ quotas and producer premiums raise prices, while powerful buyers squeeze them.
• TNCs organise global production networks and keep design, branding and finance at home; TNCs from NEEs now do the same.

Two contrasting countries: Zambia's copper and Bangladesh's garments

The syllabus wants two named countries, one of them dependent on primary commodity exports, compared on what they trade and on the benefits and challenges of trade for each. Zambia and Bangladesh make a strong pair: both are former British colonies with fast-growing populations and limited manufacturing histories, but one is landlocked and sells metal dug out of the ground, while the other is a coastal delta that sells clothing made from imported fabric. The difference in what they sell explains almost everything about their different vulnerabilities.

Zambia exports copper, with cobalt as a by-product of the same ore, from the Copperbelt around Kitwe and Chingola, and the mines still supply the great majority of its export earnings. The industry was built under colonial rule, nationalised after independence in 1964, privatised in the 1990s and is now largely foreign-owned, with Chinese, Canadian, Indian and Australian companies among the main investors. Most of the metal leaves as concentrate or blister copper rather than as finished products, so the smelting, refining, wire-making and manufacturing that add value happen abroad. Zambia is landlocked and dependent on road and rail routes through Tanzania and South Africa, and its hydropower is vulnerable to drought, so a dry year can cut electricity to the mines as well as to homes. The benefits are real: copper earns the foreign currency that pays for fuel, medicines and machinery, it provides formal jobs and tax revenue, it built the towns and railways and universities of the Copperbelt, and mining companies have brought skills and technology. The challenges are equally real: the price is set in London and Shanghai, not Lusaka; revenue and the exchange rate swing with it; the economy is an enclave in which the mines are better connected to the coast than to the farms around them; and after a decade of borrowing Zambia defaulted on its external debt in 2020 and has since been restructuring it.

Bangladesh exports ready-made garments - knitwear, shirts, trousers and jackets - which earn the great majority of its export income, with leather goods, seafood, jute products, pharmaceuticals and a small shipbuilding industry behind them. The industry began in the 1980s in export processing zones, grew rapidly on abundant labour with a large share of women workers, and survived the end of the Multi-Fibre Arrangement in 2005 that was expected to finish it. It imports the cotton and much of the fabric, so the value it adds is the cutting, sewing, finishing and shipping rather than the material; the buyers are foreign brands and retailers who set the design, the price and the delivery date. The benefits have been large: millions of jobs, most of them for women who had few paid options before, foreign currency, tax revenue, a growing textile and pharmaceutical sector, and a rate of growth that has reduced poverty and shifted the country away from jute and aid dependence. The challenges are just as large: low value added, and wages held down by competition from Vietnam, Cambodia and India. Factories have been dangerous, as the collapse of the Rana Plaza building in 2013 showed when it killed more than a thousand workers. The industry also depends on imported fabric and on a few large buyers, and the scheduled graduation from least developed country status in 2026 will remove some of the preferential access that helped it grow.

Put the two together and the pattern is clear. Zambia's vulnerability is to price and to distance: it sells a product whose price it cannot influence, from a position that adds transport cost to every tonne. Bangladesh's vulnerability is to buyers and to value added: it sells a product whose price is set by the brands that order it, and the profitable stages of design, branding and retail happen elsewhere. Both are exposed to decisions taken abroad, and both have the same long-term answer - diversify the products and the markets, and move up the value chain into processing, manufacturing and services. Bangladesh has gone further down that road, but both remain dependent on one product in a way that a diversified economy is not.

The WTO, UNCTAD and the Aid for Trade debate

The World Trade Organization (WTO) was set up in 1995 as the successor to the General Agreement on Tariffs and Trade, which had run the rules of world trade since 1947. Its members - more than 160 countries - agree a single rulebook, and its central principles are that a country must treat all its trading partners alike (most-favoured-nation treatment), must treat imported and domestic goods alike once they have entered (national treatment), and must publish its rules and keep its tariffs at the levels it has agreed to. Its job is to promote trade between countries by hosting negotiations that reduce tariffs and other barriers, and by locking in the reductions so that a later government cannot simply reverse them.

Its second job is dealing with disputes. When one member believes another has broken the rules, the WTO's dispute settlement system hears the case, publishes a ruling and authorises retaliation if the ruling is ignored, which is why countries bring cases to Geneva rather than settling them with unilateral tariffs. The system has handled some of the largest trade rows in the world, over aircraft subsidies, bananas, steel safeguards and Australia's plain packaging rules for tobacco. Its weakness is that the Appellate Body, which hears appeals, has been unable to take on new cases since 2019 because members could not agree on appointments, so a losing party can appeal into a vacuum and delay a ruling indefinitely.

Its third job is monitoring and trade facilitation. The WTO reviews each member's trade policy and publishes the results, which is the main independent record of who is protecting what. The Trade Facilitation Agreement, in force since 2017, is aimed at the delays at the border rather than at the tariff: it commits members to publish procedures, to publish fees in advance, to allow goods to be cleared before the paperwork is complete, and to cooperate between customs agencies. For a landlocked country, a day saved at a border is worth more than a small tariff cut, and the agreement is one of the clearest examples of the WTO doing practical work rather than negotiating. On intellectual property, the TRIPS Agreement requires members to protect patents, copyright, trademarks and trade secrets, which supports firms that invest in research but is contentious where it limits the production of cheap generic medicines, an argument that has been fought repeatedly over HIV and, more recently, COVID-19 vaccines.

UNCTAD, the United Nations Conference on Trade and Development, was founded in 1964 with a different purpose and a different method. It does not make binding rules. It produces research and analysis - on commodity dependence, investment, debt and the trade of least developed countries - and it uses that analysis to argue for changes in the system, which is where proposals such as preferential access for developing countries' exports came from. It also provides technical assistance, helping poorer governments negotiate agreements, build customs systems and design policies that link trade to development. In exam terms, the difference is straightforward: the WTO is the rule-maker and judge, UNCTAD is the researcher and advocate for the poorer members of the system.

Aid for Trade is a WTO-led initiative launched in 2005, and the syllabus asks you to evaluate it critically. The idea is that a trade agreement is worth little to a country that cannot produce goods to export or move them across a border, so aid is directed at trade-related infrastructure - ports, roads, cold storage, power - at customs and border systems, at standards and certification, and at trade finance and business support. The case for it is strong: it addresses the supply-side constraint that tariffs and rules alone cannot fix, it lowers the cost of trading for exactly the countries that pay the most to trade, and it can help a country use trade preferences before they are withdrawn. The criticisms are equally strong. Much of it is tied to the donor's own contractors, so the benefit leaks back to the donor; it tends to favour countries that already export rather than the poorest; it is easier to fund a road than to reach small farmers; the promises are easier to make than to disburse; and it leaves the underlying rules - tariff escalation, farm subsidies, standards that poor producers cannot meet - untouched. It also cannot compensate for a preference that is being removed: a new port does not help a garment exporter whose tariff-free access has just ended.

International aid: types, donors and a critical evaluation

International aid is the transfer of resources - money, food, equipment, expertise - from governments, organisations or charities in one country to meet needs in another. Most official aid is counted as Official Development Assistance (ODA), and the United Nations target, repeatedly missed, is 0.7 per cent of a donor's gross national income. The donors are the governments of high-income countries, the multilateral institutions they fund such as the World Bank and the United Nations agencies, and a very large number of non-governmental organisations (NGOs) such as Oxfam, Medecins Sans Frontieres and BRAC, which raise money privately and also deliver contracts paid for by governments. China and the Gulf states are significant lenders and donors too, though their spending is often counted differently.

The types are distinguished by purpose. Humanitarian aid is emergency relief after a disaster or during a conflict: search and rescue, shelter, clean water, food, medical care and protection, delivered fast and meant to last months. Development aid is long-term and aimed at the causes of poverty: schools, clinics, roads, power, agricultural extension, training and institution-building, measured in years and decades. Climate aid is money for cutting emissions and for adapting to a changing climate - flood defences, drought-resistant seed, early-warning systems, solar power - and it is politically separate from development aid because it is owed under climate agreements rather than given as charity. Tied aid is aid that must be spent on goods and services from the donor country, which is the label that matters most when you are asked to evaluate who benefits.

Aid also divides by channel. Bilateral aid goes from one government directly to another, which gives the donor control and visibility and buys diplomatic influence. Multilateral aid is paid into a fund such as the World Bank's concessional lending arm or a UN agency and then allocated across many countries, which spreads the cost, pools expertise and is generally less tied to any single donor's firms. Aid delivered through NGOs is often the fastest route to the poorest and to places governments cannot reach, and it is also the hardest to coordinate.

For receiving countries, the case for aid is straightforward. It fills the gap between what a poor country can save and what it needs to invest, it pays for schools, clinics and roads that would otherwise not be built, it supplies foreign currency for imports, it transfers skills and technology, and in an emergency it keeps people alive. It can also be the reason a country escapes a trap: vaccination campaigns, malaria control, the eradication of smallpox and the spread of primary schooling all depended heavily on external money. The criticisms are well evidenced. Aid can create dependency and weaken the pressure on a government to raise its own taxes, and it can be captured by elites or lost to corruption. Conditionality attached to loans and grants has forced policies that hurt the poor, as with the structural adjustment programmes of the 1980s, while food aid and donated second-hand clothing can undercut local farmers and producers. Tied aid reduces the value of every dollar by requiring overpriced purchases from the donor, sudden large inflows can push up prices and the exchange rate, which hurts exporters, and a fragile state may simply lack the absorptive capacity to use the money well.

For donor countries, aid buys influence, diplomatic goodwill, access to resources and markets, and support in international votes; it is also a market for the donor's own firms when it is tied, and a way of managing migration, security and disease threats before they arrive. It costs public money at a time when voters may prefer spending at home, it can be unpopular when it appears to be wasted, and it creates an obligation that outlasts the government that made it. The honest conclusion is that the benefit depends on the type of aid and the context: emergency humanitarian aid delivered through experienced agencies saves lives, and long-term development aid to a reasonably governed country with a clear plan builds capacity, while tied, politically motivated or poorly coordinated aid often benefits the donor and the contractor more than the people it was meant for.

Tourism: patterns, trends and the factors behind them

International tourism is one of the largest industries in the world, and before the COVID-19 pandemic it had grown almost without interruption for sixty years, from a few tens of millions of arrivals in the 1950s to well over a billion. The pandemic cut arrivals by around three quarters in 2020 and the recovery took until about 2024, which is itself a useful example of how exposed the industry is to a single global shock. Tourism is a form of invisible trade: the visitor buys a service in the destination country, so the spending counts as an export for the destination and an import for the country the visitor came from. Its value is measured in receipts, and receipts are not the same as arrivals - a country can attract huge numbers of visitors who spend very little each, while another earns more from far fewer people who stay longer and pay more.

The sources of international tourists are concentrated in Europe, North America and, increasingly, East Asia, because that is where the incomes, the holidays and the passports are; China's outbound market grew enormously before 2020 and has since recovered. The destinations are concentrated in Europe, which receives around half of all arrivals, followed by Asia and the Pacific and the Americas. Most tourism is also regional: the majority of European tourists stay in Europe, and most North Americans stay in North America, because short-haul travel is cheaper and easier. The characteristics of tourists matter for what a destination earns and what it suffers: package holidaymakers on a beach holiday spend differently from independent travellers, backpackers, business travellers, cruise passengers on a day stop, or pilgrims. Age, income, length of stay and whether the trip is booked through a tour operator all change the local impact.

Seasonality is one of the most visible patterns in the whole topic. In the Mediterranean, arrivals peak in July and August because of school holidays and reliable sun, and the industry runs at close to capacity for eight weeks and well below it for the rest of the year. Ski resorts peak in winter and are half-empty in summer; monsoon regions have a low season when hotels close; religious destinations peak around festivals and pilgrimage dates; and business travel drops in holiday periods. Seasonality is a problem because it produces seasonal employment, overcrowding and water and waste pressure in the peak, and underused capacity and insecure incomes outside it. Destinations try to flatten it with festivals, conferences, sports events and off-season pricing, with limited success.

Four factors explain the growth and the pattern. Developments in transport and ICT come first: wide-bodied jets and then low-cost airlines cut the real cost of flying, airports and routes multiplied, cruise ships grew enormous, high-speed rail took short-haul business traffic, and online booking, review sites, mapping, social media and mobile payment removed the travel agent from the middle of the transaction. Affordability follows: rising real incomes, paid holiday entitlement, cheap fares and package deals put foreign travel within reach of a mass market rather than a wealthy few. TNC involvement shapes where the tourists actually stay: international hotel chains such as Marriott, Hilton, Accor and IHG, tour operators such as TUI, and cruise corporations such as Carnival and Royal Caribbean control a large share of the accommodation, the flights and the itineraries, and they decide which destinations are sold and at what price. Government support is the fourth: visa liberalisation, direct flights negotiated between governments, national tourist boards and advertising campaigns, tax incentives for hotel investment, and tourism treated in national plans as a source of foreign currency and jobs - as it is in Kenya, Indonesia, the Maldives and many small island states.

Trends in different types of tourism are worth learning as a set. Business tourism covers meetings, conferences, exhibitions and incentive trips, spends heavily per head, is concentrated in cities and is not seasonal in the holiday sense. Recreational and sport tourism ranges from beach holidays to ski trips, golf, diving, and travel to mega-events such as the Olympic Games or the football World Cup, which bring a short, intense surge of visitors and a long bill for stadiums. Seasonal tourism is the sun-and-ski pattern described above. Medical tourism sends patients abroad for treatment, dentistry, cosmetic surgery or fertility care, attracted by lower prices and shorter waits, and it is well established in Thailand, India, Turkey and Hungary. Ecotourism is small-scale, nature-based travel intended to fund conservation and benefit local people, and it is associated with Costa Rica, the Galapagos Islands, Kenya's conservancies and Bhutan. Cultural and heritage tourism is built on historic cities, archaeological sites, museums, festivals and pilgrimage, and it is the reason places such as Venice, Kyoto, Angkor and Petra have to manage visitor numbers at all.

Impacts of tourism, carrying capacity and sustainability

Economic impacts are the reason governments want tourism. It earns foreign currency, which pays for imports and services debt; it creates jobs directly in hotels, restaurants, transport and guiding, and indirectly in farming, fishing, construction and handicrafts; it supports small businesses that need little capital; and the money spent circulates, creating a multiplier effect as employees and owners spend their wages locally. It also pays for infrastructure - airports, roads, water and power - that residents use too. The negatives are just as important. Leakage is the money that leaves: imported food and drink for hotels, foreign-owned hotels repatriating profits, overseas tour operators keeping most of the package price, and interest on foreign loans. Tourism is often seasonal, so jobs are insecure and incomes uneven; it can be an enclave industry with little connection to the rest of the economy; it raises land prices and the cost of living for residents; and a destination dependent on one or two source markets is exposed to a recession, a currency crisis, a pandemic or a terrorist attack in a way that a diversified economy is not.

Social impacts cut both ways. Tourism can pay for the restoration of monuments, churches and crafts, give communities a reason to keep a language, a dance or a festival alive, bring cultural exchange and educate visitors, and improve local services and training. It can also commodify culture, turning a religious ceremony into a scheduled show and a craft into a souvenir; push up rents and house prices until residents are priced out of their own town; bring crime, alcohol, drugs and prostitution; create resentment between visitors and residents; and produce a demonstration effect in which young people adopt the spending patterns of tourists they cannot afford. The distribution matters: the people who bear the crowding and the noise are rarely the people who receive the receipts.

Environmental impacts are the ones examiners expect you to be specific about. Tourism consumes land for hotels, golf courses, marinas and airports, often on the coast or in the forest where habitats are most valuable; it uses enormous quantities of water for pools, gardens and golf in places where water is scarce; it generates waste and sewage that small islands and mountain valleys cannot treat; it damages coral through anchors, divers and warming, and erodes dunes and footpaths through sheer traffic; and it disturbs wildlife. Above all it generates greenhouse gases, because aviation is carbon-intensive and long-haul travel is the least efficient way to move a person per kilometre. Against that, tourism revenue funds national parks, rangers, anti-poaching and habitat restoration, and gives a local community an economic reason to protect a forest rather than log it.

Carrying capacity is the idea that ties the impacts together: the number of visitors a place can absorb before the damage outweighs the benefit. It has three forms. Physical or ecological capacity is the point at which the beach, the reef, the water supply or the waste system is degraded. Social or perceptual capacity is the point at which residents feel that their town no longer belongs to them, or visitors feel that the place is too crowded to be worth visiting - the two often arrive together. Economic capacity is the point at which tourism earns less than the alternatives it has displaced, or when the infrastructure needed to serve it costs more than it brings. A destination can be below its physical capacity and above its social one: the reef is fine and the residents are furious.

Sustainability is therefore a question of balance, not of growth alone. The syllabus asks you to weigh the economic, social and environmental impacts against each other, and to think about sustainability from the visitor's side as well as the destination's. Carbon cost is central: a long-haul return flight can emit more carbon than everything else a visitor does in a fortnight, so the greenest holiday is often the nearest one, which is awkward for small island states whose entire economy depends on long-haul arrivals. Destinations make environmental claims that are hard to check - 'eco' resorts with imported fittings, offset schemes that plant trees of uncertain survival, certification labels with weak standards, and 'sustainable' destinations that are still expanding their airports. Offsetting is not the same as reducing, and a claim is not a measurement. The defensible judgement is that tourism can be sustainable where numbers are held below carrying capacity, where the money stays local, where water, waste and land are managed, and where the emissions of the journey are counted rather than ignored - and that most destinations adopt these measures after the damage is visible, not before.

Two contrasting tourist areas: Bali and Bhutan

Bali, an island of Indonesia, is the classic example of mass international tourism in a place with a distinctive culture. Tourism grew from the 1970s around Kuta and Sanur, spread along the south coast to Legian, Seminyak and Nusa Dua, and is now served by an international airport at Denpasar with direct flights from Australia, East Asia and beyond. The attraction is a combination of beaches and surfing, Hindu temples and ceremonies, rice terraces irrigated by the traditional subak system, volcanoes, diving, and a reputation for cheap accommodation and nightlife. Bali is the largest single earner of foreign currency among Indonesia's tourist destinations and supports a large share of the island's workforce directly and indirectly.

The impacts are those of mass tourism at scale. Economically, Bali earns a great deal but leaks much of it: international hotel chains, imported food and drink for resorts, foreign-owned villas, and tour operators selling packages abroad all take a share. Socially, the south has been transformed - land prices and rents have risen far beyond local wages, farming families have sold rice fields for villas and guesthouses, traffic in Denpasar and Kuta is heavily congested, and sacred sites such as temple ceremonies are regularly disrupted by visitors. Environmentally, the pressure falls on water, land and waste: hotels, pools, gardens and golf courses draw heavily on groundwater while rice irrigation needs it, farmland is converted, rivers and beaches carry plastic, and the coral and dive sites suffer from anchor damage and warming water.

Management has been attempted on several fronts: land-use zoning and building-height and setback rules, restrictions on new development in the south, water licensing and groundwater charges, waste collection and clean-up campaigns, the closure of some beaches and sites to visitors at certain times, a code of conduct for temple behaviour, and a tourist levy of 150 000 rupiah per international visitor introduced in 2024 to fund cultural and environmental protection. The evaluation is mixed. The levy raises money and focuses attention, but it is small relative to the cost of the damage and is not a limit on numbers; zoning has been unevenly enforced, particularly where local officials and investors share an interest in development; waste and water problems persist because the infrastructure has not kept pace with the hotels; and Bali has no overall cap on arrivals. The most that can be said is that Bali recognises the problem and has begun to price and regulate it, but that carrying capacity in the south is already exceeded in the dry season.

Bhutan is the opposite model. A small Himalayan kingdom with a policy of 'high value, low volume', it admits international tourists only through licensed tour operators, on guided itineraries, with a Sustainable Development Fee charged per person per night - raised sharply in 2022 and later reduced - and with a limited number of flights into its single international airport at Paro, which keeps numbers low by design. Its stated aim is to protect a Buddhist culture and a forested landscape, and it has been able to claim that its forests absorb more carbon than the country emits.

The impacts of that model are different in kind. Bhutan earns a high amount per visitor and avoids the crowding, waste and land conversion that mass tourism brings; visitor numbers are tiny compared with Bali's, and the fee funds conservation, training and free healthcare and education. The costs are also real: tourism provides relatively few jobs and little income for a population that is young and increasingly mobile, the country depends heavily on Indian visitors who pay a lower fee, the requirement to travel with a guide and pay a daily fee discourages the independent and lower-budget travellers who might return, and the model depends on air access through one difficult airport. Bhutan has effectively chosen a lower economic return in exchange for cultural and environmental protection, and whether that is a success depends on what you value: by arrivals and income it is a small industry, and by cultural and forest protection it is one of the most successful in the world.

The pair is the comparison the syllabus wants. Bali shows what happens when carrying capacity is exceeded and management arrives late, and Bhutan shows what a destination can do when it sets a limit before the pressure arrives. Neither is a complete answer. Bali's problem is not that it earns too little but that the earnings are unevenly shared and the costs are borne locally; Bhutan's problem is not that it protects too much but that the protection is partly paid for by keeping ordinary travellers and ordinary jobs out. The judgement to make is that which model is better depends on the destination's priorities, its carrying capacity and who is expected to benefit - and that tourism is only sustainable where the number of visitors, the money they leave behind and the damage they do are all being managed, not just the first of the three.