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.

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.

For further reading, see Floating And Fixed Exchange Rates.

Related Articles
  1. Taxes

    How American Expats Are Taxed

    Learn what tax forms American expats are required to file, what tax breaks and deductions are available, and what potential pitfalls to avoid.
  2. Forex

    Main Factors That Influence Exchange Rates

    The exchange rate is one of the most important determinants of a country's relative level of economic health, and can impact your returns.
  3. Fundamental Analysis

    3 Times the FOMC Got It Right This Century

    Learn about three times that the Federal Open Market Committee (FOMC) and the Federal Reserve took positive steps to help the economy in the 21st century.
  4. Fundamental Analysis

    Quantitative Easing Report Card in 2016

    Find out why quantitative easing has not worked, despite the best efforts of the Federal Reserve, and how it has fueled the national debt problem.
  5. Investing News

    How Interest Rates Can Go Negative

    Central banks from Europe to Japan have implemented a negative interest rate policy (NIRP) in order to stimulate economic growth.
  6. Economics

    The Delicate Dance of Inflation and GDP

    Investors must understand inflation and gross domestic product, or GDP, well enough to make decisions without becoming buried in data.
  7. Economics

    Industries That Thrive On Recession

    Recessions are not equally hard on everyone. In fact, there are some industries that even flourish amid the adversity.
  8. Personal Finance

    5 Places Where Your Travel Dollar Goes Furthest

    The dollar is pretty strong right now, but where is it strongest? Canada? South Africa? Europe? Here are five places to travel to right now on a budget.
  9. Economics

    Will Silver Recover in 2016? (SLV, GLD, JJC)

    The end of the silver downtrend is likely to coincide with similar recoveries in gold, iron and copper.
  10. Forex

    The Consumer Price Index

    Find out how this economic measure can help you make key financial decisions.
RELATED FAQS
  1. How valuable is the forward rate as an overall economic indicator?

    Any given forward rate is theoretically equal to its corresponding spot rate plus future expectations. Many investors and ... Read Full Answer >>
  2. What is comparative advantage?

    Comparative advantage is an economic law that demonstrates the ways in which protectionism (mercantilism, at the time it ... Read Full Answer >>
  3. How does the Wall Street Journal prime rate forecast work?

    The prime rate forecast is also known as the consensus prime rate, or the average prime rate defined by the Wall Street Journal ... Read Full Answer >>
  4. What's the difference between microeconomics and macroeconomics?

    Microeconomics is generally the study of individuals and business decisions, macroeconomics looks at higher up country and ... Read Full Answer >>
  5. How does a cost-of-living adjustment (COLA) affect my salary?

    Some companies build salary adjustments into their compensation structures to offset the effects of inflation on their employees. ... Read Full Answer >>
  6. How do you make working capital adjustments in transfer pricing?

    Transfer pricing refers to prices that a multinational company or group charges a second party operating in a different tax ... Read Full Answer >>
Hot Definitions
  1. Liquidation Margin

    Liquidation margin refers to the value of all of the equity positions in a margin account. If an investor or trader holds ...
  2. Black Swan

    An event or occurrence that deviates beyond what is normally expected of a situation and that would be extremely difficult ...
  3. Inverted Yield Curve

    An interest rate environment in which long-term debt instruments have a lower yield than short-term debt instruments of the ...
  4. Socially Responsible Investment - SRI

    An investment that is considered socially responsible because of the nature of the business the company conducts. Common ...
  5. Presidential Election Cycle (Theory)

    A theory developed by Yale Hirsch that states that U.S. stock markets are weakest in the year following the election of a ...
Trading Center