What a foreign exchange rate is
A foreign exchange rate is the price (or value) of one currency in terms of another — e.g. £1 = 1.20 dollars. Examiners look for the word price or value. It is the currency's external value (worth against other currencies), not its internal value (what it buys at home, which is about inflation), and not the balance of trade. It can be quoted either way round (£1 = 1.20 dollars, or 1 dollar = £0.83).
How a floating rate is set
Under a floating system the rate is set by the demand for and supply of the currency. Demand to buy it comes from: foreigners buying exports, inward FDI (foreign direct investment), hot money attracted by high interest rates, and speculators expecting a rise. Supply comes from: residents buying imports, outward investment, and speculators expecting a fall. It settles where demand = supply; more demand (or less supply) raises it.
Appreciation vs depreciation
A rise in a floating currency is an appreciation, a fall a depreciation. Appreciation (rate rises): exports dearer, imports cheaper — SPICED: Strong Pound, Imports Cheaper, Exports Dearer. Depreciation (rate falls): exports cheaper, imports dearer — candidates often reverse this. The effect on the current account depends on the price elasticity of demand for exports and imports, improving only if demand is elastic enough.
Drawn from real examiner reports.
Appreciation ≠ depreciation (direction)
The most frequent error is reversing the price effects. A rise (appreciation) makes exports dearer and imports cheaper — not the other way round. Fix it in two steps: (1) decide if the rate has risen or fallen, then (2) apply SPICED (a stronger currency buys more foreign goods, so imports cheaper, exports dearer). State the direction before any conclusion.
June 2022 Paper 2 Q4(b) and June 2023 Paper 2 Q3(d): candidates confused depreciation with appreciation, and many explained a rise in the rate as making exports cheaper and imports dearer — the wrong way round. November 2022 Paper 2 Q2(b) also noted candidates confusing a rise with a fall.
External value ≠ internal value
The exchange rate is the external value of a currency — its price against other currencies. Many candidates instead write about the internal value — what it buys at home — really about inflation and the domestic price level. A depreciation lowers the currency's external value; keep the analysis on export and import prices, not shop prices at home.
June 2022 Paper 2 Q4(b): many candidates wrote about a fall in the internal value of the currency without linking it to the external value (the exchange rate).
Exchange rate ≠ balance of trade
A weak definition treats the exchange rate as "when a country exchanges goods with another country" — that confuses it with the balance of trade (the value of exports minus imports). The exchange rate is the price or value of one currency in terms of another. Give a numerical example and do not describe buying and selling of goods — that is trade, not the rate.
June 2022 Paper 2 Q2(a): very weak answers confused the term with the balance in value between total imports and exports ("when a country exchanges goods and services with another country at a particular rate").
Depreciation ≠ automatic gain
A depreciation makes exports cheaper and imports dearer, but does not automatically improve the current account. It only does so if demand for exports and imports is price-elastic enough: if demand is inelastic, cheaper exports earn less revenue and dearer imports are still bought. Always state the elasticity condition.
Revaluation/devaluation are fixed terms
Under a floating system a rise is an appreciation and a fall a depreciation — market-driven. Revaluation and devaluation are the deliberate equivalents made by a government under a fixed system. Do not call a floating-rate rise a "revaluation": match the term to the system (market forces vs government decision).
Exports demand it, imports supply it
Keep the demand/supply directions straight. Buying exports raises demand for the currency (pushing the rate up); buying imports raises its supply (pushing the rate down). Reversing these gives the wrong rate movement. Higher interest rates attract hot money, raising demand and the rate.
The Paper 2 (a)–(d) ladder
The 0455 Paper 2 ladder: (a) define (2) — precise meaning only; (b) explain (4) — one point developed; (c) analyse (6) — a sustained one-sided chain, no evaluation; (d) discuss (8) — both sides plus a supported judgement.
Fixed-rate (d): weigh the level
On a fixed-rate discuss, do not just identify ideas (constrained monetary policy, certainty) — develop them, and weigh the significance of the level at which the rate is fixed. A rate fixed too low can cause inflation; one fixed too high harms exporters.
Write the direction before the effect
To avoid the classic direction slip, always write whether the rate has risen or fallen first, then apply SPICED. Making the direction explicit lets an examiner follow your logic and stops one slip on direction from unravelling the whole answer.
Bring in elasticity for trade effects
When judging how an exchange-rate change affects the current account or revenue, use price elasticity of demand. A cheaper export raises revenue only if demand is elastic; a depreciation improves the current account only if export and import demand is elastic enough.
A foreign exchange rate is the price of one currency in terms of another currency. For example:
means one pound can be exchanged for one dollar and twenty cents.
Get the definition mark: say it is the price or value of a currency against another currency. A good example (£1 = $1.20) helps. Do not describe it as "exchanging goods between countries" — that is trade, not the exchange rate.
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