Trade Theories and Patterns

Spec mapping (AQA 7037): Paper 2, §3.2.1 Global Systems — international trade and access to markets; the nature and role of trade in goods and services; trading relationships and patterns between countries and groups at different levels of development; the differential access to markets associated with globalisation. Synoptic links: TNCs and global production networks (Lesson 3), financial systems and debt (Lesson 4), and the development gap (Lesson 9). This lesson balances AO1 (the orthodox liberal trade theories and their structuralist critiques), AO2 (applying theory to located trade relationships), and AO3 (terms-of-trade indices, trade-balance calculation and a correlation exemplar).

International trade is a primary driver of globalisation and the principal mechanism by which countries plug into the world economy. The central intellectual debate — examined here at depth — is between the orthodox/neoliberal account (trade as mutually beneficial, founded on comparative advantage) and the structuralist/dependency account (trade as an unequal exchange that reproduces global inequality). A strong depth answer holds both in tension.

Key Definition: International trade is the exchange of goods, services and capital between countries. Its pattern is shaped by comparative advantage, factor endowments, government policy, the rules set by IGOs such as the WTO, and the structural power of richer economies to set the terms on which exchange occurs.

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Absolute Advantage (Smith, 1776)

Adam Smith's theory of absolute advantage holds that a country should specialise in goods it can produce using fewer resources than others, then trade. Brazil produces coffee more cheaply (climate, soils); the UK produces financial services more cheaply (institutions, skills); both gain from specialisation and exchange. Its limitation — what if one country is more efficient at everything? — led directly to Ricardo.

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Comparative Advantage (Ricardo, 1817)

David Ricardo's theory of comparative advantage is the cornerstone of liberal trade theory. It argues countries should specialise where their opportunity cost is lowest, even if they hold no absolute advantage.

Country	Wine (units/hour)	Cloth (units/hour)	Opportunity cost of 1 wine	Specialise in
Portugal	10	5	0.5 cloth	Wine
England	4	3	0.75 cloth	Cloth

Portugal sacrifices only 0.5 units of cloth to make a unit of wine, England 0.75 — so Portugal has the comparative advantage in wine and should specialise in it, England in cloth. Total output rises and both gain through trade, even though Portugal is absolutely more productive in both goods. This counter-intuitive result is the theoretical engine of the entire free-trade case.

Real-World Application

• Bangladesh specialises in garments — abundant low-cost labour gives a comparative advantage despite limited technology
• Germany specialises in high-value engineering and automotive output — skilled labour and capital
• Saudi Arabia specialises in crude oil — vast reserves give an overwhelming energy advantage

Criticisms of Comparative Advantage

• Assumes perfect competition, full employment and free trade — none of which holds in reality
• Ignores transport costs, which can wipe out theoretical gains
• Ignores economies of scale and learning effects, which can create advantage (the basis of New Trade Theory, Paul Krugman)
• Encourages over-specialisation and vulnerability to commodity price shocks
• Crucially, it is static — it tells a country to specialise in what it is currently good at (e.g. raw cocoa), potentially locking it into low-value activity while richer countries capture the high-value processing. This is the bridge to the structuralist critique.

New Trade Theory (Krugman)

Paul Krugman's New Trade Theory (Nobel Prize, 2008) updates Ricardo for a world of imperfect competition. It argues that much trade is explained not by inherent comparative advantage but by economies of scale, network effects and historical accident: once a country or region establishes a large-scale industry, falling unit costs and agglomeration give it a self-reinforcing advantage that late entrants cannot match — regardless of who was "naturally" best suited. This has two profound implications. First, it provides a modern, mainstream justification for the infant-industry argument: strategic, temporary support can help a domestic industry reach the scale at which it becomes competitive (precisely what the East Asian developmental states did). Second, it shows that comparative advantage can be created by policy rather than merely inherited — undermining the laissez-faire reading of Ricardo and partly vindicating the structuralist insistence that the existing pattern of specialisation is not a natural given but a historically constructed hierarchy that can, in principle, be changed.

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The Structuralist Challenge: Dependency and World-Systems

The orthodox theory treats trade as a positive-sum game between equals. Structuralist theorists argue the global trading system is a hierarchy that systematically transfers value from poor to rich.

Dependency Theory (Frank, 1967)

Andre Gunder Frank argued that underdevelopment is not an original condition but is actively produced by the world economy. His model divides the world into a metropolis (core) and satellites (periphery): surplus is drained from satellite to metropolis through trade and investment, so "the development of the metropolis is the underdevelopment of the satellite." Colonialism wired peripheral economies to export cheap primary commodities and import expensive manufactures — a structure that persists. Frank's polemical phrase, "the development of underdevelopment", captures the claim that poor countries are not "behind" but were made poor by integration on adverse terms.

World-Systems Theory (Wallerstein, 1974)

Immanuel Wallerstein refined this into a single capitalist world-system with three tiers — core, semi-periphery and periphery — connected by an unequal division of labour. Unlike Frank's binary, Wallerstein's semi-periphery (e.g. China, Brazil, Mexico) is mobile and acts as a political buffer, which explains how some countries rise. The system is dynamic but structured to concentrate capital-intensive, high-profit activity in the core.

graph LR
  P["PERIPHERY<br/>cheap primary commodities<br/>(cocoa, copper, coffee)"] -->|low-value exports| SP["SEMI-PERIPHERY<br/>assembly & manufacturing<br/>(China, Mexico, Brazil)"]
  SP -->|manufactured goods| C["CORE<br/>R&D, finance, brands<br/>(USA, Germany, Japan)"]
  C -->|high-value goods,<br/>capital, IP rents| SP
  SP -->|investment, machinery| P
  C -.->|terms of trade<br/>favour the core| P

Evaluation: Structuralism powerfully explains commodity dependence and the development gap, but it struggles to explain the East Asian "tiger" economies and China, which integrated deeply into global trade and grew rapidly — evidence the orthodox camp uses to argue that openness, not autarky, is the route out of the periphery. The strongest answers treat dependency as a tendency that can be escaped through industrial policy, not an iron law.

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Terms of Trade and the Prebisch–Singer Hypothesis

The terms of trade (ToT) measure the ratio of a country's export prices to its import prices:

$\text{ToT} = \frac{\text{index of export prices}}{\text{index of import prices}} \times 100$ToT=index of import pricesindex of export prices​×100

Above 100 the ToT are favourable (a given volume of exports buys more imports); below 100 they are unfavourable.

The Prebisch–Singer hypothesis (Raúl Prebisch and Hans Singer, working independently c.1950) holds that the long-run ToT of primary-commodity exporters decline relative to manufactures. The mechanism: demand for manufactures has high income elasticity (people buy proportionally more as they get richer), whereas demand for food/raw materials has low income elasticity (Engel's Law); meanwhile productivity gains in manufacturing accrue to producers as profit/wages, but in commodities they are competed away into lower prices. The result is a structural transfer that widens the development gap (Lesson 9).

Worked AO3 Skills Exemplar — Terms of Trade and Trade Balance

A peripheral economy reports the following indices (base year = 100):

Year	Export price index	Import price index	Terms of trade
2010	100	100	100
2016	78	112	69.6
2022	95	130	73.1

Describe: The ToT collapsed from 100 to 69.6 by 2016 and only partly recovered to 73.1 by 2022 — a sustained deterioration.

Manipulate: For 2016, $\text{ToT} = \dfrac{78}{112} \times 100 = 69.6$ToT=11278​×100=69.6. This means that by 2016 the country had to export roughly 44% more volume to buy the same basket of imports as in 2010, since $\dfrac{100}{69.6} \approx 1.44$69.6100​≈1.44.

Explain: This is the Prebisch–Singer pattern: falling commodity export prices (e.g. a copper or cocoa price slump) combined with rising prices for imported manufactures and fuel squeeze purchasing power and government revenue, often forcing borrowing (Lesson 4).

Evaluate: Index numbers are sensitive to the base year and to the composition of the basket; a single ToT figure hides whether the cause is falling export prices or rising import prices. They also ignore volume changes — a country could offset falling prices by exporting more (immiserising growth). Rigorous analysis pairs ToT with the trade balance.

Case Study — Zambia and copper: Copper is roughly 70% of Zambia's export earnings. When copper prices slumped in 2015–16, the ToT deteriorated, the kwacha lost over 40% of its value against the US dollar, fiscal revenue fell, and Zambia's debt burden became unsustainable — culminating in its 2020 sovereign default (the first African default of the pandemic). A textbook illustration of commodity dependence and Prebisch–Singer in action.

A worked trade balance completes the toolkit: if exports = US$8.2 billion and imports = US$9.7 billion, the balance is $8.2 - 9.7 = -1.5$8.2−9.7=−1.5, i.e. a deficit of US$1.5 billion, financed by borrowing or FDI.

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Trade Blocs

Trade blocs reduce or remove barriers between members, forming a spectrum of integration.

Type	Features	Example
Free Trade Area	No internal tariffs; each member sets its own external tariff	USMCA (formerly NAFTA)
Customs Union	No internal tariffs; common external tariff	Mercosur
Common/Single Market	Customs union + free movement of labour and capital	EU Single Market
Economic Union	Single market + harmonised macroeconomic policy	Eurozone

• EU — the world's largest single market: 27 members, ~450 million consumers, free movement of goods, services, capital and people; the Common Agricultural Policy (CAP) subsidises European farmers. Critics argue the EU's external tariffs and CAP subsidies depress prices and shut developing-country agricultural exporters out of European markets — a structuralist point about differential access.
• USMCA (2020, replacing NAFTA) — under NAFTA (1994–2020) trilateral trade roughly tripled, but US manufacturing job losses fed Ross Perot's "giant sucking sound" critique; USMCA adds digital-trade, labour and environment provisions.
• ASEAN — 10 members; AFTA cut internal tariffs to 0–5%; the RCEP (2020) links ASEAN with China, Japan, South Korea, Australia and New Zealand to form the world's largest bloc by combined GDP, signalling the shift of trade gravity to Asia.

Trade creation vs trade diversion is the key evaluative concept (Jacob Viner): blocs create trade by letting members specialise efficiently, but may divert trade away from more efficient non-members behind the common external tariff — which is precisely why blocs can disadvantage outsiders such as African exporters.

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Free Trade vs Protectionism

Case for free trade	Case for protectionism
Efficiency via comparative advantage	Infant-industry argument (Friedrich List) — temporary protection lets new industries reach scale
Lower consumer prices	Preserves jobs in uncompetitive sectors
Larger markets, faster growth	National security of strategic goods (food, defence, semiconductors)
Technology transfer, innovation	Prevents dumping (selling below cost to destroy rivals)
Strengthens diplomatic ties	Defends environmental/labour standards against a race to the bottom

The infant-industry argument is historically powerful: Britain, the USA, Germany, Japan and South Korea all industrialised behind tariff walls before preaching free trade — what Ha-Joon Chang calls "kicking away the ladder". This is a vital evaluative card: the very countries that now demand open markets developed through protection.

Methods of Protectionism

Method	Mechanism	Example
Tariffs	Tax on imports, raising their price	US 25% tariff on Chinese steel (from 2018)
Quotas	Quantity limit on imports	Historic EU quotas on Chinese textiles
Subsidies	Payments making domestic producers cheaper	EU CAP
Non-tariff barriers	Regulations/standards/bureaucracy that raise import costs	National food-safety and phytosanitary rules

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The World Trade Organisation (WTO)

The WTO (1995, succeeding GATT of 1947; HQ Geneva) administers trade rules among its 164 members, settles disputes through a binding mechanism, monitors trade policy and supports negotiations.

Criticisms

• Democratic deficit — formally one-country-one-vote and consensus-based, but in practice the US, EU and increasingly China dominate "green-room" bargaining
• Bias towards the rich — US and EU agricultural subsidies distort world markets yet have proved near-impossible to reform
• The Doha "Development" Round (launched 2001) has effectively stalled, failing on the very development issues it was named for
• Weakened enforcement — the Appellate Body has been paralysed since 2019 after the USA blocked the appointment of judges, hollowing out dispute settlement
• Narrow remit — it prioritises liberalisation over social, labour and environmental concerns

The dispute mechanism in practice — agricultural subsidies

The WTO's strength and its limits are visible in agriculture. US and EU subsidies systematically depress world prices and harm developing-country farmers — the US cotton subsidies case is the classic example: in a long-running dispute, Brazil successfully challenged US cotton subsidies at the WTO (rulings in the mid-2000s), the Appellate Body finding they breached WTO rules and depressed world cotton prices to the detriment of producers including the impoverished "Cotton Four" (Benin, Burkina Faso, Chad, Mali). Yet the outcome was telling: rather than abolish the subsidies, the USA negotiated a payment to Brazil (hundreds of millions of dollars to a Brazilian cotton institute) to settle the dispute — a vivid illustration that even when the rules-based system works for a developing challenger, powerful states can buy their way out rather than reform, leaving the poorest cotton producers (who could not bring such a case) no better off. This single case lets you argue both that the WTO can constrain great powers and that enforcement is shaped by power — exactly the balanced evaluation examiners reward.

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The Fair Trade Movement

Fair trade offers an alternative that guarantees producers a minimum price plus a social premium, long-term contracts, democratic cooperative organisation and environmental standards.

Case study — Ethiopian coffee: Ethiopia is coffee's birthplace and a top global producer. The volatile "C-price" benchmark fell below US$1 per pound in 2019, below the cost of production for many farmers. Fairtrade guarantees a floor (around US$1.40 per pound plus a US$0.20 social premium). The Oromia Coffee Farmers' Co-operative Union represents over 400,000 farmers and has channelled premiums into schools and clinics.