US Dollar

The US dollar is the official currency of the United States, issued in physical form by the US Treasury and managed through the Federal Reserve System. Far beyond US borders, it is the default unit for pricing oil and gold, settling international trade, and issuing global debt.

Economists call this an anchor or reserve role: when companies in two different countries trade with each other, they often settle in dollars even if neither side is American. That standing global demand is a big part of what makes the dollar different from every other currency.

The Federal Reserve, the central bank of the United States, manages the dollar. It sets short-term interest rates, supervises banks, and adjusts the supply of money in pursuit of two goals set by Congress: stable prices and maximum employment.

New dollars enter circulation mainly through the banking system, when the Fed buys securities or lends to banks, and through everyday bank lending. Physical notes are printed by the Treasury, but the overall supply of money is shaped by Fed policy.

Most portfolios are measured in some currency, and for US investors that measuring stick is the dollar. When people say stocks are up or gold is up, they usually mean up in dollars, so changes in the dollar itself quietly affect how every other number reads.

A stronger dollar tends to make imports cheaper for Americans and can pressure the earnings of US companies that sell abroad. A weaker dollar can do the reverse, and has often coincided with rising prices for hard assets like gold. Investors also watch the dollar as a stress gauge: in many past crises, global demand for dollars rose sharply.

A dollar is not a fixed measure of value. US consumer prices have risen in most years for the past century, which means each dollar buys a little less over time. An item that cost one dollar a few decades ago typically costs more than two dollars now, and the Federal Reserve deliberately aims for about 2 percent inflation per year.

This slow erosion is why savers compare the interest cash earns to the inflation rate, and why many investors hold assets like stocks, real estate, gold, or bitcoin alongside cash. Understanding inflation is the single most useful background for understanding any currency, starting with this one.

The dollar cannot be measured against itself, so analysts track it against baskets of other currencies. The best known basket is the dollar index, which weighs the dollar most heavily against the euro, plus the yen, pound, and a few others. The Federal Reserve also publishes broader trade-weighted dollar indexes that cover more trading partners.

Reserve currency status means central banks around the world keep a large share of their savings in dollar assets, mainly US Treasury bonds. That arrangement took shape after World War II and has persisted since, even as the dollar's share of global reserves has slowly drifted down from its peaks.