Exchange Rate

The Foreign Exchange Market

The foreign exchange market, universally called the forex or FX market, is the largest and most liquid financial market in the world by daily trading volume, with the Bank for International Settlements' 2022 Triennial Central Bank Survey reporting approximately seven point five trillion dollars in average daily turnover. 

The market has no central exchange or physical location — it is a fully decentralised, over-the-counter market operating through networks of banks, dealers, and electronic trading platforms across London, New York, Tokyo, Singapore, Hong Kong, and other financial centres, running continuously from the opening of Asian markets on Monday morning through the close of New York markets on Friday afternoon.

Major currencies traded in the FX market include the United States dollar, the euro, the Japanese yen, the British pound, the Swiss franc, the Canadian dollar, and the Australian dollar. 

The dollar is by far the most dominant currency in global FX trading, appearing on one side of approximately eighty-eight percent of all FX transactions according to BIS data, reflecting its role as the world's primary reserve currency and the denomination of most commodity contracts, international debt, and cross-border transactions.

Spot Rates and Forward Rates

Two categories of exchange rate are fundamental to understanding FX market mechanics.

The spot rate is the rate at which a currency can be exchanged for immediate delivery — technically settlement occurs two business days after the trade date under the standard T-plus-two convention for most major currency pairs, though the transaction is economically described as immediate. 

When a corporation needs to convert dollar receipts to euros today, it transacts at the spot rate. The spot rate is the rate reported in financial media and on currency data services as the current exchange rate for any currency pair.

The forward rate is the rate at which two parties agree today to exchange currencies at a specified future date — typically thirty, sixty, ninety, or one hundred and eighty days forward, though longer maturities are available in liquid currency pairs. 

The forward rate differs from the spot rate by the forward premium or forward discount, which reflects the interest rate differential between the two currencies. 

A currency with a higher interest rate trades at a forward discount relative to the lower-rate currency — forward exchange rate agreements theoretically eliminate arbitrage between holding domestic assets and hedging currency risk in foreign assets, a relationship formalised in the covered interest rate parity condition. The forward market allows corporations with known future foreign currency obligations or receipts to hedge their currency exposure at a known rate, eliminating the uncertainty of future spot rate movements.

Three Exchange Rate Regimes

Countries choose among three broad exchange rate regimes, each with distinct implications for monetary policy independence, inflation control, and economic adjustment to external shocks.

A floating exchange rate, also called a flexible exchange rate, allows the market to determine the currency's value through the continuous interaction of supply and demand without government or central bank intervention to maintain any target level. The United States dollar, the euro, the Japanese yen, the British pound, the Canadian dollar, and the Australian dollar are all freely floating currencies. Floating rates have the advantage of automatic adjustment — if a country runs a current account deficit, downward pressure on its currency makes its exports cheaper and its imports more expensive, gradually correcting the imbalance without requiring policy action. The disadvantage is volatility — floating currencies can experience rapid and large movements that create uncertainty for businesses engaged in international trade and investment.

A fixed exchange rate, also called a currency peg, ties the currency's value to another currency, a basket of currencies, or historically to a commodity such as gold. Under a fixed rate regime, the central bank commits to buying or selling its currency at the fixed rate whenever the market price diverges, using foreign exchange reserves to support the peg. Saudi Arabia, the United Arab Emirates, and other Gulf states maintain pegs to the United States dollar as a matter of monetary policy design, reflecting the dollar denomination of their primary export revenues. The Bretton Woods system, which governed international monetary arrangements from 1944 until its collapse in 1971 to 1973, required member countries to maintain fixed parities to the dollar within one percent, with the dollar itself fixed to gold at thirty-five dollars per ounce. The advantage of a fixed rate is exchange rate certainty for traders and investors. The disadvantage is the loss of monetary policy independence — the central bank cannot use interest rates to manage domestic economic conditions independently because every rate decision must be compatible with maintaining the peg.

A managed float, also called a dirty float, combines elements of both systems. Market forces primarily determine the exchange rate, but the central bank intervenes periodically to dampen excessive volatility or prevent the rate from moving beyond an informal target range. China, Singapore, and Vietnam operate managed float systems of varying degrees. The People's Bank of China sets a daily reference rate for the renminbi and permits trading within a band around that reference rate, using intervention to prevent the rate from straying outside the permitted range. Managed floats allow governments to obtain most of the adjustment benefits of a floating rate while retaining the capacity to smooth disorderly market conditions.

Currency Appreciation and Depreciation

A currency appreciates when its value rises relative to another currency — when more units of the foreign currency are required to purchase one unit of the appreciating currency. A currency depreciates when its value falls. The terms appreciation and depreciation are used exclusively in the context of floating exchange rates. When a fixed exchange rate is officially revalued upward — increased in value — the appropriate term is revaluation. When it is officially lowered, the term is devaluation.

The investment implications of currency movements are direct and significant. When the dollar appreciates against the euro, a United States investor holding euro-denominated assets experiences a loss in dollar terms as the euro value of those assets converts to fewer dollars. Conversely, a falling dollar increases the dollar returns of a United States investor holding foreign assets denominated in currencies that have appreciated against the dollar. This currency return — or currency loss — is entirely separate from and additive to the local market return on the investment, making currency exposure management a critical dimension of international portfolio management.

For corporations, a stronger dollar reduces the dollar value of foreign currency revenues earned by United States exporters and multinational companies — their overseas earnings convert to fewer dollars when repatriated. A weaker dollar has the opposite effect, boosting the dollar value of foreign earnings. This currency translation effect on corporate earnings is disclosed in the Management Discussion and Analysis section of annual reports and is a regular source of earnings surprises when exchange rate movements diverge from hedging assumptions.

Factors Determining Exchange Rates

Exchange rates in floating rate systems are determined by the full range of economic and financial forces affecting the relative attractiveness of holding assets denominated in each currency.

Interest rate differentials are among the most powerful determinants of short to medium-term exchange rate movements. When a country raises its interest rates relative to other countries, its currency typically appreciates because higher rates attract capital from international investors seeking better returns on deposits and fixed income instruments. This capital inflow increases demand for the domestic currency, bidding up its price. The Federal Reserve's 2022 to 2023 tightening cycle, which raised the federal funds rate by five hundred and twenty-five basis points while other major central banks tightened less aggressively, contributed to significant dollar appreciation against most major currencies during that period.

Inflation differentials exert a powerful influence on long-term exchange rates through purchasing power parity — the theory that exchange rates should adjust over the long run to equalise the purchasing power of different currencies. A country experiencing higher inflation than its trading partners will see its currency depreciate over time to maintain price competitiveness, because if its prices rise faster domestically than internationally, its currency must fall to keep its exports competitively priced. The empirical evidence confirms purchasing power parity as a reasonable description of long-run exchange rate trends, though significant deviations persist for years or even decades in the short to medium term.

Current account balances reflect the net flow of goods, services, and income between a country and the rest of the world. A country with a persistent current account deficit — importing more than it exports — is continuously supplying its currency to foreign sellers and demanding foreign currency, creating downward pressure on its exchange rate over time. A persistent surplus country experiences the opposite dynamic. The United States' persistent current account deficit has been partially offset by the safe-haven demand for dollar assets and by the dollar's reserve currency status, preventing the depreciation that purchasing power parity models would otherwise predict.

Political stability and economic confidence are less quantifiable but equally important drivers of exchange rates. Currencies of politically stable, well-governed economies with strong institutions attract capital from investors seeking the security of rule-of-law environments and reliable contract enforcement. Political crises, corruption scandals, and policy reversals create capital flight that depreciates the affected currency.

Purchasing Power Parity

Purchasing power parity is the most important theoretical framework for understanding long-run exchange rate equilibrium and appears directly in Series 65 examination contexts.

Absolute purchasing power parity holds that the exchange rate between two currencies should equal the ratio of the price levels of the two countries — a basket of goods costing one hundred dollars in the United States should cost the pound equivalent of one hundred dollars in the United Kingdom at the prevailing exchange rate. The Economist's Big Mac Index, which compares the price of a McDonald's Big Mac across countries and derives an implied exchange rate from the price comparison, is a widely publicised application of absolute purchasing power parity.

Relative purchasing power parity is the more practically useful formulation, holding that the percentage change in the exchange rate between two countries should equal the difference in their inflation rates over the same period. If the United States experiences three percent inflation and Japan experiences one percent inflation, the dollar should depreciate against the yen by approximately two percent to maintain purchasing power parity. Relative PPP works reasonably well as a description of long-run exchange rate trends but is a poor predictor of short-term movements, which are dominated by capital flows, risk sentiment, and monetary policy expectations rather than by inflation differentials.

Exchange Rate Risk and Hedging

Exchange rate risk — also called currency risk or FX risk — is the possibility that changes in exchange rates will reduce the value of investments, receivables, or payables denominated in foreign currencies. Three categories of exchange rate risk apply to different contexts.

Transaction risk is the risk that a specific foreign currency receivable or payable will be worth more or less in domestic currency terms than expected when the transaction was initiated. A United States exporter who sells goods to a European buyer for one million euros and will collect payment in ninety days faces transaction risk — if the euro depreciates against the dollar during those ninety days, the dollar value of the receivable falls. Transaction risk is managed through forward contracts, currency futures, or currency options that lock in a known exchange rate for the future transaction.

Translation risk is the risk that the reported financial results of a foreign subsidiary, when translated from the subsidiary's functional currency into the parent company's reporting currency, will be adversely affected by exchange rate movements. Under ASC 830, Foreign Currency Matters, assets and liabilities of foreign subsidiaries are translated at current exchange rates while equity is translated at historical rates, with translation differences recorded in accumulated other comprehensive income on the balance sheet.

Economic risk, also called operating risk, is the long-term risk that sustained exchange rate movements will alter a company's competitive position — making its products more or less expensive relative to foreign competitors in ways that affect revenues and costs over time regardless of any specific transaction.

The Bretton Woods System and Its Collapse

The Bretton Woods international monetary system, established at the United Nations Monetary and Financial Conference at Bretton Woods, New Hampshire in July 1944, created the post-World War II framework of fixed exchange rates that governed international finance for nearly three decades. Under Bretton Woods, member countries pegged their currencies to the dollar within one percent of agreed par values, and the dollar was itself convertible to gold at the fixed rate of thirty-five dollars per ounce. The International Monetary Fund was created at the same conference to provide balance of payments support to member countries defending their pegs and to coordinate international monetary cooperation.

The system collapsed in 1971 to 1973 when the United States — running persistent balance of payments deficits driven by military spending and the Great Society social programs — found it impossible to maintain the dollar's gold convertibility at thirty-five dollars per ounce. President Nixon suspended dollar gold convertibility on August 15, 1971 in what became known as the Nixon Shock, effectively ending the Bretton Woods system. The Smithsonian Agreement of December 1971 attempted to stabilise exchange rates at new levels but lasted only until March 1973, when the major currencies moved to freely floating rates. The floating rate era has continued ever since.

Examination Relevance and Key Takeaways

Exchange rates are tested on the Series 65 examination in the context of international investing, currency risk, purchasing power parity, and the effect of currency movements on investment returns and corporate earnings.

The core points to retain are these: an exchange rate is the price of one currency in terms of another, determined continuously in the global over-the-counter foreign exchange market with approximately seven point five trillion dollars in average daily turnover per the 2022 BIS Triennial Survey; the spot rate is the current market rate for immediate exchange while the forward rate is the agreed rate for a future exchange reflecting interest rate differentials through covered interest rate parity; the three exchange rate regimes are the free float where market supply and demand determine rates without intervention, the fixed rate or peg where the central bank commits to maintaining a target rate using foreign exchange reserves, and the managed float or dirty float where markets primarily determine rates with periodic central bank intervention to smooth excessive volatility; currency appreciation means the currency buys more foreign currency while depreciation means it buys less, with revaluation and devaluation referring to official adjustments of fixed rate pegs; interest rate differentials drive short to medium-term exchange rate movements as higher rates attract capital inflows that appreciate the currency; purchasing power parity holds that long-run exchange rates should equalise the purchasing power of currencies with relative PPP predicting that the percentage change in the exchange rate equals the inflation rate differential between the two countries; transaction risk is the exposure of specific foreign currency receivables and payables to exchange rate movements managed through forward contracts and currency options; translation risk affects the reported financial results of foreign subsidiaries translated into the parent's reporting currency under ASC 830; the Bretton Woods system of fixed exchange rates pegged to a dollar convertible to gold at thirty-five dollars per ounce operated from 1944 until President Nixon suspended gold convertibility on August 15, 1971, after which major currencies moved to freely floating rates.