How Does the Government Regulate Exchange Rates?
The government regulates exchange rates only indirectly. That's because most exchange rates are set on the open foreign exchange market. In countries like China, where the rate is fixed, the government directly changes the rate. To find out exactly how this is done, see How Does China Affect the U.S. Dollar?
The U.S. government has various tools to influence the U.S. dollar exchange rate against foreign currencies.
For example, if it lowers the rate, that drives down interest rates throughout the U.S. banking system. It also reduces the supply of money. Both of those make the dollar stronger relative to other currencies. That's because U.S. dollar-denominated credit has become more expensive. At the same time, dollar-denominated assets generate a higher return. Both create more demand for the dollar, while taking it out of circulation. The laws of demand and supply tell you that less supply and more demand drives up the price. When that happens to the dollar, it can purchase more foreign currency on forex markets.
The Treasury Department is a government agency that also indirectly affects the exchange rate. It prints more money, which increases the supply, weakening the dollar.
It can also borrow more money from other countries. That's done by selling Treasury notes. That not only increases the supply of money, it also increases the debt. Both will send the dollar's value down.
The third government tool is expansionary fiscal policies. They weaken the dollar by increasing the money supply.
But these policies can also improve economic growth. That often makes investors demand more dollars as a safe haven. It's like a vote of confidence in the economy. Sometimes this demand is so high that investors overlook the low interest rate they are getting by investing in dollars or U.S. Treasurys. The demand is even greater than the expansion in supply of dollars. For more, see 3 Ways to Measure the Value of the Dollar.
Although the government is powerful in influencing exchange rates, it is still forex trading that actually changes them.
How the Government Regulates Foreign Exchange Trading
The Chicago Futures Trading Commission regulates the forex brokers. It oversees all U.S. forex brokerage companies, enforces its regulations, and prosecutes outright fraud. Its authority was strengthened in 2010 with the Dodd-Frank Wall Street Reform Act.
Approximately 95 percent of the $5.3 trillion traded daily on forex markets are spot currency transactions, rather than futures transactions. Since they consist of two-day delivery rather than cash, they are considered the same as futures contracts. Therefore, brokers must register as a Commodity Trading Advisor, a Futures Commission Merchant, an Introducing Broker or a Commodity Pool Operator with the CFTC and become Members of NFA.
(Source: “Regulatory Agencies That Help Prevent Forex Fraud,” ForexFraud.com.)
The U.S. National Futures Association is a self-regulating association. All U.S. forex brokers operating for other U.S. clients must register. Its objective is to protect the integrity of U.S. markets and to protect investors from fraud. But it doesn't get involved with the value of any particular currency.
In addition, banks are responsible for most of the trades. The Federal Reserve regulates many of them. For example, in 2013, the Fed required banks to add more liquidity. They began buying Treasurys since they could be sold for cash whenever crisis threatened. The 25 largest banks increased their Treasury holdings by 88 percent by February 2015. It pushed down yields on long-term Treasurys. That strengthened the dollar.
For more, see How Do Bonds Affect the Stock Market?