A-Level Economics: Trade and Exchange Rates

International trade and exchange rates form the global half of the A-level macro paper, and they are where numeric reasoning and model intuition combine most sharply. This quiz covers both, from Ricardo to the J-curve.

The trade theory questions are built on worked two-country examples with stated output numbers: distinguishing absolute advantage (total output per resource unit) from comparative advantage (opportunity cost ratios) — including the classic configuration where one country holds absolute advantage in both goods but comparative advantage lies elsewhere, computed through opportunity costs of 0.5 versus 0.25 units of cloth per wine. The limitations question was rebuilt during verification to be genuinely discriminating: constant-returns assumptions and ignored transport costs as real limitations, against factually false claims about the theory as distractors.

Protectionism is tested through the tariff's actual incidence: higher domestic prices, expanded domestic production and producer surplus, at consumers' expense. The exchange-rate questions cover both regimes — the floating system's automatic balance-of-payments adjustment, and the fixed-peg defence requiring the central bank to buy its own currency — plus depreciation's dual effect: costlier imports and more price-competitive exports.

The advanced material is tested as intuition in words: the Marshall-Lerner condition (export and import demand elasticities summing above one for a depreciation to improve the trade balance) and the J-curve's short-run deterioration through pre-existing contracts and slow volume adjustment.

Each explanation shows the opportunity-cost arithmetic or the adjustment mechanism in full, matching the quantitative and chain-of-reasoning demands of the international economics questions.

• Compute comparative advantage from opportunity cost ratios in two-country examples
• Distinguish absolute from comparative advantage and state the theory's limitations
• Analyse tariff effects on prices, production and surplus
• Contrast floating and fixed exchange rate adjustment mechanisms
• Explain the Marshall-Lerner condition and the J-curve in words

Aligned to "The global context" area of the DfE's GCE A level economics subject content: international trade, trade policies, and exchange-rate changes, with the quantitative-skills requirement applied to comparative advantage calculations.