Real Exchange Rates As a result, U.S. exports rise, and U.S. imports fall, and both of these changes raise U.S. net exports. Conversely, an appreciation.

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Real Exchange Rates As a result, U.S. exports rise, and U.S. imports fall, and both of these changes raise U.S. net exports. Conversely, an appreciation in the U.S. real exchange rate means that U.S. goods have become more expensive compared to foreign goods, so U.S. net exports fall.

A FIRST THEORY OF EXCHANGE-RATE DETERMINATION: PURCHASING-POWER PARITY The purchasing-power parity theory is the simplest and most widely accepted theory explaining the variation of currency exchange rates.

The Basic Logic of Purchasing- Power Parity Purchasing-power parity is a theory of exchange rates whereby a unit of any given currency should be able to buy the same quantity of goods in all countries. According to the purchasing-power parity theory, a unit of any given currency should be able to buy the same quantity of goods in all countries.

The Basic Logic of Purchasing- Power Parity The theory of purchasing-power parity is based on a principle called the law of one price. According to the law of one price, a good must sell for the same price in all locations. If the law of one price were not true, unexploited profit opportunities would exist. The process of taking advantage of differences in prices in different markets is called arbitrage.

The Basic Logic of Purchasing- Power Parity If arbitrage occurs, eventually prices that differed in two markets would necessarily converge. According to the theory of purchasing- power parity, a currency must have the same purchasing power in all countries and exchange rates move to ensure that.

Implications of Purchasing- Power Parity If the purchasing power of the dollar is always the same at home and abroad, then the exchange rate cannot change. The nominal exchange rate between the currencies of two countries must reflect the different price levels in those countries.

Implications of Purchasing- Power Parity When the central bank prints large quantities of money, the money loses value both in terms of the goods and services it can buy and in terms of the amount of other currencies it can buy.

Figure 3 Money, Prices, and the Nominal Exchange Rate During the German Hyperinflation 10,000,000,000 1,000,000,000,000, , Exchange rate Money supply Price level 1925 Indexes (Jan = 100)

Limitations of Purchasing-Power Parity Many goods are not easily traded or shipped from one country to another. Tradable goods are not always perfect substitutes when they are produced in different countries.

Net exports are the value of domestic goods and services sold abroad minus the value of foreign goods and services sold domestically. Net capital outflow is the acquisition of foreign assets by domestic residents minus the acquisition of domestic assets by foreigners.

An economy’s net capital outflow always equals its net exports. An economy’s saving can be used to either finance investment at home or to buy assets abroad.

The nominal exchange rate is the relative price of the currency of two countries. The real exchange rate is the relative price of the goods and services of two countries.

When the nominal exchange rate changes so that each dollar buys more foreign currency, the dollar is said to appreciate or strengthen. When the nominal exchange rate changes so that each dollar buys less foreign currency, the dollar is said to depreciate or weaken.

According to the theory of purchasing- power parity, a unit of currency should buy the same quantity of goods in all countries. The nominal exchange rate between the currencies of two countries should reflect the countries’ price levels in those countries.

BOP Deficits & Surpluses Neither good nor bad just a measure of trade reality. However, reserves have a limit and if exhausted a nation must alter its trade policies. –Macro adjustments (AE). –Tariffs/quota –Depreciate currency