Aside from factors such as interest rates and inflation, the exchange rate is one of the most important determinants of a country's relative level of economic health. Exchange rates play a vital role in a country's level of trade, which is critical to most every free market economy in the world. For this reason, exchange rates are among the most watched, analyzed and governmentally manipulated economic measures. But exchange rates matter on a smaller scale as well: they impact the real return of an investor's portfolio. Here we look at some of the major forces behind exchange rate movements.
Overview
Before we look at these forces, we should sketch out how exchange rate movements affect a nation's trading relationships with other nations. A higher currency makes a country's exports more expensive and imports cheaper in foreign markets; a lower currency makes a country's exports cheaper and its imports more expensive in foreign markets. A higher exchange rate can be expected to lower the country's balance of trade, while a lower exchange rate would increase it.
Determinants of Exchange Rates
Numerous factors determine exchange rates, and all are related to the trading relationship between two countries. Remember, exchange rates are relative, and are expressed as a comparison of the currencies of two countries. The following are some of the principal determinants of the exchange rate between two countries. Note that these factors are in no particular order; like many aspects of economics, the relative importance of these factors is subject to much debate.
1. Differentials in Inflation
As a general rule, a country with a consistently lower inflation rate exhibits a rising currency value, as its purchasing power increases relative to other currencies. During the last half of the twentieth century, the countries with low inflation included Japan, Germany and Switzerland, while the U.S. and Canada achieved low inflation only later. Those countries with higher inflation typically see depreciation in their currency in relation to the currencies of their trading partners. This is also usually accompanied by higher interest rates. (To learn more, see Cost-Push Inflation Versus Demand-Pull Inflation.)
2. Differentials in Interest Rates
Interest rates, inflation and exchange rates are all highly correlated. By manipulating interest rates, central banks exert influence over both inflation and exchange rates, and changing interest rates impact inflation and currency values. Higher interest rates offer lenders in an economy a higher return relative to other countries. Therefore, higher interest rates attract foreign capital and cause the exchange rate to rise. The impact of higher interest rates is mitigated, however, if inflation in the country is much higher than in others, or if additional factors serve to drive the currency down. The opposite relationship exists for decreasing interest rates - that is, lower interest rates tend to decrease exchange rates. (For further reading, see What Is Fiscal Policy?)
3. Current-Account Deficits
The current account is the balance of trade between a country and its trading partners, reflecting all payments between countries for goods, services, interest and dividends. A deficit in the current account shows the country is spending more on foreign trade than it is earning, and that it is borrowing capital from foreign sources to make up the deficit. In other words, the country requires more foreign currency than it receives through sales of exports, and it supplies more of its own currency than foreigners demand for its products. The excess demand for foreign currency lowers the country's exchange rate until domestic goods and services are cheap enough for foreigners, and foreign assets are too expensive to generate sales for domestic interests. (For more, see Understanding The Current Account In The Balance Of Payments.)
4. Public Debt
Countries will engage in large-scale deficit financing to pay for public sector projects and governmental funding. While such activity stimulates the domestic economy, nations with large public deficits and debts are less attractive to foreign investors. The reason? A large debt encourages inflation, and if inflation is high, the debt will be serviced and ultimately paid off with cheaper real dollars in the future. In the worst case scenario, a government may print money to pay part of a large debt, but increasing the money supply inevitably causes inflation. Moreover, if a government is not able to service its deficit through domestic means (selling domestic bonds, increasing the money supply), then it must increase the supply of securities for sale to foreigners, thereby lowering their prices. Finally, a large debt may prove worrisome to foreigners if they believe the country risks defaulting on its obligations. Foreigners will be less willing to own securities denominated in that currency if the risk of default is great. For this reason, the country's debt rating (as determined by Moody's or Standard & Poor's, for example) is a crucial determinant of its exchange rate.
5. Terms of Trade
A ratio comparing export prices to import prices, the terms of trade is related to current accounts and the balance of payments. If the price of a country's exports rises by a greater rate than that of its imports, its terms of trade have favorably improved. Increasing terms of trade shows greater demand for the country's exports. This, in turn, results in rising revenues from exports, which provides increased demand for the country's currency (and an increase in the currency's value). If the price of exports rises by a smaller rate than that of its imports, the currency's value will decrease in relation to its trading partners.
6. Political Stability and Economic Performance
Foreign investors inevitably seek out stable countries with strong economic performance in which to invest their capital. A country with such positive attributes will draw investment funds away from other countries perceived to have more political and economic risk. Political turmoil, for example, can cause a loss of confidence in a currency and a movement of capital to the currencies of more stable countries.
7. Activities of foreign exchange markets and speculative currency transactions
If the rate of a currency tends to decline firms and banks sell it for a more stable currency and it worsens the position of weakened currency. Currency markets react quickly to changes in the economy and politics, fluctuations in exchange ratios. In doing so, they increase opportunities of currency speculations and spontaneous movement of "hot" money.
8. The degree of confidence in the national and world currency markets
It depends on the economy and political situation in the country as well as the factors indicated above which affect the exchange rate. Dealers take into account not only the rate of economic growth, inflation, the purchasing power of currencies, the balance of demand and supply of currency, but the prospects of their dynamics. Sometimes, even the expectation of the publication of official data on the trade balance and the balance of payments or election results affects the ratio of supply and demand and currency rate. Sometimes, in the currency market there is a change of priorities in favor of political news, rumors of resignations of ministers, etc.
9. The monetary policy. The ratio of market and state regulation of the exchange rate affects its dynamics
The formation of the exchange rate on foreign exchange markets through the mechanism of demand and supply of currency is usually accompanied by sharp fluctuations in exchange relations. Real exchange rate forms in the market which is an indicator of the economy, money, finance, credit and confidence in a certain currency. State regulation of the exchange rate is aimed at its raising or lowering on the basis of the purposes of monetary and economic policy.
10. National income is not an independent component that can change itself
However, in general, the factors which lead to changes in the national income have a great impact on the exchange rate. Thus, an increase in the supply of products enhances the exchange rate, while increases in domestic demand reduce its rate. In the long run, a higher national income means higher value of the currency of the country.
11. Market factors
These factors can significantly change the value of currency at short intervals. Thus, the overall expectations for future economic growth, changes in fiscal and foreign trade deficits directly affect the exchange rate. In addition, the foreign exchange market participants' expectations have a significant impact on the value of the exchange rate. Seasonal peaks and downs of business activity in the country have a significant impact on the rate of national currency.
Conclusion
The exchange rate of the currency in which a portfolio holds the bulk of its investments determines that portfolio's real return. A declining exchange rate obviously decreases the purchasing power of income and capital gains derived from any returns. Moreover, the exchange rate influences other income factors such as interest rates, inflation and even capital gains from domestic securities. While exchange rates are determined by numerous complex factors that often leave even the most experienced economists flummoxed, investors should still have some understanding of how currency values and exchange rates play an important role in the rate of return on their investments.
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