Purchasing Power and Real Exchange Rate Quiz

Purchasing power parity states that in the long run, exchange rates between two countries should adjust to equalize the price of identical goods and services when expressed in a common currency. If goods are cheaper in one country, demand shifts there until prices equalize through exchange rate adjustment, trade flows, or both.

The answer is True. Absolute purchasing power parity predicts that exchange rates will adjust until identical goods cost the same in both countries when converted to a common currency. When this condition holds, the real exchange rate equals one, meaning one unit of currency buys the same amount of goods in both countries and no purchasing power advantage exists between the two economies.

Relative purchasing power parity focuses on changes rather than absolute levels. It states that the percentage change in the exchange rate between two countries should equal the difference in their inflation rates over the same period. If one country has higher inflation, its currency should depreciate by that excess inflation amount to maintain purchasing power parity.

Purchasing power parity implies the exchange rate should equalize the price of the same good in both countries. Dividing the US price of 5 dollars by the UK price of 4 pounds gives 1.25 dollars per pound. At this exchange rate, the Big Mac costs the same in both countries when expressed in a common currency, satisfying the purchasing power parity condition.

The answer is False. Purchasing power parity is generally considered a long-run concept rather than a short-run one. In the short run, many factors prevent immediate exchange rate adjustment to price level changes, including capital flows, speculation, trade barriers, transportation costs, and non-tradable goods. Exchange rates tend to converge toward purchasing power parity only over extended periods.

Purchasing power parity faces several practical limitations. Transportation costs and trade barriers prevent full arbitrage of goods across borders. Many services are non-tradable. Capital flows driven by interest rates and risk can push exchange rates away from their PPP levels. Quality differences also complicate price comparisons, making exact PPP a useful benchmark rather than a precise empirical outcome.

A real exchange rate of 1.4 compared to the purchasing power parity benchmark of 1 indicates that domestic goods are more expensive than foreign goods when expressed in a common currency. This suggests the domestic currency is overvalued relative to what purchasing power parity would imply, and theory predicts eventual depreciation toward the parity level.

The answer is True. Because purchasing power parity predicts the real exchange rate should equal one in the long run, economists use the real exchange rate as a direct empirical test of parity. When the real exchange rate persistently deviates from one, it indicates that purchasing power parity does not hold, and researchers investigate the structural or policy reasons behind the divergence.

The Balassa-Samuelson effect explains why richer, more productive countries tend to have higher price levels for non-tradable goods such as services. Because productivity gains raise wages across the economy, prices for services rise faster than in poorer countries. This causes higher overall price levels in wealthier nations, meaning their real exchange rates persistently exceed one even in long-run equilibrium.

When a currency is undervalued according to purchasing power parity, the nominal exchange rate is set below the level that would equalize prices across countries. This means the country's goods appear cheap to foreign buyers relative to their true value when compared through the parity lens, and the theory predicts the currency should appreciate toward its purchasing power parity level over time.

The real exchange rate and purchasing power parity are directly connected. PPP predicts the real rate equals one when price levels are equalized across countries. Deviations from one signal departures from parity, with values above one suggesting overvaluation and values below one suggesting undervaluation. Economists use the real exchange rate as their empirical tool for evaluating whether purchasing power parity holds across country pairs.

The answer is True. Purchasing power parity performs poorly as a short-run exchange rate predictor because many other factors dominate short-run currency movements, including interest rates, capital flows, and market sentiment. However, over long horizons, exchange rates tend to revert toward purchasing power parity levels, making it a valuable benchmark for assessing whether a currency is fundamentally over or undervalued.

A real exchange rate consistently below one means domestic goods are cheaper than foreign goods when expressed in a common currency. This implies the domestic currency has greater purchasing power within the home country than abroad, and according to purchasing power parity, the currency may be undervalued, with theoretical pressure for it to appreciate toward the parity level over time.

Purchasing power parity provides a way to compare real income and living standards across countries by removing the distortion caused by different price levels. By converting incomes and prices to a common purchasing power measure, economists can make meaningful comparisons of how much people in different countries can actually buy, regardless of nominal exchange rate differences.

Purchasing power parity has well-documented limitations as an equilibrium benchmark. Productivity differences between rich and poor countries systematically distort price levels. Non-tradable goods cannot be arbitraged across borders. Trade barriers and transport costs add friction. Financial flows routinely push exchange rates away from parity levels for years, confirming that PPP is a long-run guide rather than a precise short-run predictor of the real exchange rate.