The U.S. dollar's role as the world's dominant reserve currency gives American firms a measurable financial edge: they can borrow, invest, and write international contracts in their own currency, avoiding the exchange-rate conversion risks that burden foreign competitors. Research summarized by the Federal Reserve Bank of Philadelphia, drawing on work by Wharton's William Diamond and New York Fed economist Peter Van Tassel, finds that international demand for dollar assets lowers interest rates for U.S. firms relative to a counterfactual without that demand. That advantage is not guaranteed indefinitely. Sanctions policy, BRICS payment initiatives, and the slow maturing of the euro and renminbi all pose long-term questions about how durable the arrangement is—and what it would cost U.S. companies if it eroded.
The Enduring Pillars of Dollar Dominance
As Scott A. Wolla explains in a Federal Reserve Bank of St. Louis publication, the dollar is widely used in global trade and finance, and that ubiquity is self-reinforcing. Because so many transactions, reserves, and debt instruments are denominated in dollars, the currency offers liquidity and predictability that others struggle to match. This stability makes it easier for U.S. companies to participate in international markets, influencing borrowing costs and business decisions across the broader economy.
The dollar's position also rests on the depth of U.S. financial markets. As the Philadelphia Fed notes, international investors and foreign central banks want dollar-denominated assets such as Treasury securities because they can be easily sold in international markets at a predictable price. That deep, liquid market for dollar assets is what allows the U.S. Treasury to finance large budget deficits at lower interest rates—and it is the same demand that filters through to corporate borrowing costs.
