International Trade and Finance

9 min read

International trade examines the gains from exchanging goods and services across borders and the policies that mediate those exchanges. With Pakistan's external sector chronically constrained, this topic is among the most relevant in the CSS Economics syllabus.

Absolute Advantage

A country has absolute advantage in producing a good if it can produce more of that good than another country using the same amount of resources. Adam Smith argued such advantages drive mutually beneficial trade.

Classical theories

Absolute Advantage (Adam Smith, 1776)

Each country should specialise in goods it produces most efficiently and trade for the rest.

Comparative Advantage (David Ricardo, 1817)

Even if a country is absolutely less efficient in everything, it gains by specialising in the good with the lowest opportunity cost. The cornerstone result of trade theory — and a perennial CSS favourite.

Numerical illustration:

	Cloth (hours per unit)	Wine (hours per unit)
Pakistan	4	5
UK	10	6

Pakistan has absolute advantage in both. But the opportunity cost of cloth in Pakistan (5/4 wine) is lower than in the UK (6/10 wine). So Pakistan specialises in cloth, UK in wine — both gain.

Modern theories

Heckscher–Ohlin (factor-endowment) theorem

Countries export goods that intensively use the factor they have in abundance. Capital-abundant countries export capital-intensive goods; labour-abundant ones export labour-intensive goods. Pakistan's textiles fit this pattern.

Leontief Paradox

Wassily Leontief found post-war US exports were more labour-intensive than its imports — contradicting H-O. Resolutions include human capital, natural resource considerations and product cycles.

New Trade Theory (Krugman)

Explains intra-industry trade through:

Increasing returns to scale
Product differentiation
Imperfect competition

This is why Pakistan and Bangladesh both export and import textiles — niches differ.

Porter's National Competitive Advantage (Diamond)

Four conditions: factor conditions, demand conditions, related/supporting industries, firm strategy/structure/rivalry. Plus role of government and chance.

Key Points

Stolper-Samuelson: free trade benefits the abundant factor; harms the scarce one.
Factor Price Equalisation (Samuelson): trade in goods can substitute for factor mobility.
Rybczynski theorem: an increase in one factor expands output of goods intensive in it.
Linder hypothesis: countries with similar incomes trade more (intra-industry trade).

Instruments of trade policy

Tariffs — specific (per unit) or ad valorem (% of value).
Quotas — quantitative limits.
Subsidies — to exporters or to import-competing sectors.
VERs (voluntary export restraints), NTBs (non-tariff barriers), technical/SPS measures.
Anti-dumping and countervailing duties.

Effects of a tariff (small country)

Producer surplus rises
Consumer surplus falls
Government revenue rises
Deadweight loss arises (production + consumption distortion)

Optimal tariff theory says a large country can improve its terms of trade with a positive tariff — but retaliation often follows.

Arguments for protection

Infant-industry argument (Friedrich List).
Strategic-trade argument (Brander–Spencer) for high-tech, oligopolistic sectors.
National security (defence, food).
Diversification of production base.
Anti-dumping safeguards.

Counter-arguments: rent-seeking, capture, persistence of "infant" status, deadweight loss.

Balance of payments

The BoP records all transactions between residents and the rest of the world:

Account	Examples
Current Account	Trade in goods & services, primary income (remittances), secondary income
Capital Account	Capital transfers, sale/purchase of non-produced assets
Financial Account	FDI, portfolio, other investments, reserve assets

Identity: CA + KA + FA + errors = 0 (when reserve change is treated as a financial item).

Pakistan's structural challenge: a chronic trade deficit partially offset by workers' remittances (close to US$30 billion/year at recent peaks).

Exchange rate regimes

Regime	Features	Pakistan history
Fixed	Pegged to anchor currency; needs reserves	Pre-1982 (pegged to USD)
Managed float	Central bank intervenes within bands	Post-1982 to 2018 (mostly)
Free float	Market-determined	Post-IMF EFF (2019 onward, with episodes)
Currency board	100% reserve backing	Hong Kong
Dollarisation	Adoption of foreign currency	Ecuador, El Salvador

Determinants of exchange rates

Purchasing Power Parity (PPP) — long-run: e × P* = P.
Interest Rate Parity — short-run capital arbitrage.
Monetary approach — relative money supplies.
Portfolio balance — risk-adjusted asset preferences.

Pakistan's exchange-rate journey

1949: Refused to devalue with sterling; trade with India fell.
1955: First devaluation.
1972: Major devaluation under Bhutto.
2018-2019: Sharp rupee adjustment.
2022-2023: Successive depreciations; SBP allowed market-based rate under IMF programme.

International institutions

IMF (1944) — short-term BoP support; surveillance under Article IV. Pakistan has had numerous programmes (most recently EFF and SBA).
World Bank — long-term project and policy lending.
WTO (1995, succeeded GATT 1947) — multilateral trade rules. Key principles: Most-Favoured-Nation (MFN) treatment and National Treatment.
Regional: SAARC (largely dormant), SCO, ECO, ASEAN. CPEC blends bilateral investment with regional connectivity.

WTO agreements

GATT 1994 — goods.
GATS — services.
TRIPS — intellectual property.
AoA — agriculture.
DSU — dispute settlement.

For CSS analytic answers on trade policy, always identify who gains and who loses within Pakistan from any given measure (e.g., textile tariffs benefit Faisalabad producers but raise costs for downstream apparel exporters). Linking distributional impact to political economy distinguishes a top-grade answer.

Modern issues

Global value chains and their fragility after COVID-19.
De-globalisation and reshoring.
Trade and climate — carbon border adjustments (EU CBAM).
Digital trade and data flows.
Trade-debt nexus in low-income economies including Pakistan.

A grounded answer should combine theory with concrete examples — Pakistan's textile concentration, the GSP+ EU scheme, or the Free Trade Agreement with China — to demonstrate command of both content and context.