Who Controls Currency — and Why the Dollar Still Dominates
Author: Protik Ganguly
Every currency in your wallet is a claim on an economy. Understanding whose claim is stronger — and why — explains more about global power than most political analysis does.
Currency values are determined by supply and demand in foreign exchange markets — the largest financial market in the world, trading approximately $7.5 trillion daily (BIS, 2025). Unlike stocks, there is no central exchange. Banks, governments, hedge funds, corporations, and individuals buy and sell currencies continuously. The price of one currency in terms of another — the exchange rate — reflects the aggregate judgement of this market about the relative value of two economies.
One distinction worth understanding: the strongest currency by face value is not the most powerful currency globally. The Kuwaiti dinar buys more US dollars per unit than any other currency. But the dollar dominates global power — involved in 89% of all foreign exchange transactions worldwide (St. Louis Fed, 2026). Face value and global influence are different things.
Who controls currency: central banks manage money supply while treasuries manage government spending. Exchange rates, however, are set by markets — not declarations. Political statements about currency control rarely move markets the way markets move themselves. The market is always the final authority.
Why the dollar is powerful: the US dollar accounts for 89% of global foreign exchange transactions, 58% of global foreign exchange reserves, and 54% of global trade invoicing (Bipartisan Policy Center, 2025). This is reserve currency status — the dollar is the default medium for international trade, central bank reserves, and commodity pricing. Oil is priced in dollars. When a Malaysian company buys Indonesian palm oil, the transaction is often settled in dollars. This creates continuous global demand for dollars regardless of what the US economy is doing domestically.
Reserve currency status was not designed. It was earned through the size and depth of US financial markets, the legal system protecting contracts and property rights, the stability of US institutions, and the Bretton Woods agreement of 1944 (CFR, 2023). No currency has come close to displacing it since. The euro accounts for approximately 20% of global reserves — a distant second.
What makes one currency stronger than another: interest rate differentials attract capital inflows and strengthen currencies. Higher inflation erodes purchasing power and weakens them. Countries that export more than they import create foreign demand for their currency. Political stability draws investment; instability drives capital away.
The dollar's dominance is likely to persist in the near and medium term. Gold hitting $4,600 per troy ounce in early 2026 — driven by central banks diversifying reserves away from dollars — is the clearest signal that dollar credibility is under real pressure even if no alternative has emerged (IISS, 2026). The yuan is not freely convertible. The euro lacks the fiscal union that would make it a true competitor. Reserve currency status will erode slowly over decades, not collapse suddenly. Institutional trust is as important to that status as economic fundamentals — and both are worth watching.
References
Bipartisan Policy Center. (2025, December 18). What's behind the US dollar's dominance? https://bipartisanpolicy.org/explainer/whats-behind-the-u-s-dollars-dominance-and-why-it-matters/
Council on Foreign Relations. (2023). The dollar: The world's reserve currency. https://www.cfr.org/backgrounders/dollar-worlds-reserve-currency
IISS. (2026, January). The future of dollar dominance. https://www.iiss.org/online-analysis/six-analytic-blog/2026/01/the-future-of-dollar-dominance/
St. Louis Fed. (2026, February). The US dollar's role as a reserve currency. https://www.stlouisfed.org/open-vault/2026/feb/us-dollar-role-as-reserve-currency
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