World reserve currencies

When nations trade and save, they need a common money to price oil, settle debts and hold in their vaults. Across history one currency at a time has played that role — the world reserve currency — and holding it confers immense, and temporary, power.

A relay race of empires

The dominant trading power’s money tends to become everyone’s money. Historians trace a rough succession: Portugal, then Spain, the Dutch guilder, French livre, British pound sterling — and, since the mid-20th century, the US dollar. Each reign lasted roughly a century before the next power’s money took over.

How the dollar won: Bretton Woods, 1944

As the Second World War ended, the Allied nations met at Bretton Woods and designed the post-war system around the United States, which held most of the world’s gold. The deal:

The US dollar was pegged to gold at $35 an ounce, redeemable by foreign governments.
Every other currency was pegged to the dollar.
So the dollar became the world’s reserve — “as good as gold”, and easier to hold.

Nations parked their savings in dollars and US Treasury bonds rather than metal. The dollar sat at the centre of global trade and finance, a position it still holds.

The exorbitant privilege. Issuing the reserve currency is a superpower: the world must acquire your money to trade, so you can run deficits, borrow cheaply, and effectively export your inflation to everyone who holds your currency. French officials in the 1960s called it America’s “exorbitant privilege”.

The crack in the design

Bretton Woods carried a fatal flaw. The US promised foreign governments they could always redeem dollars for gold — but it kept printing dollars to fund domestic spending and the Vietnam War, far beyond the gold it actually held. Sooner or later, other countries would notice there were far more dollars abroad than gold in Fort Knox, and start cashing in. When France and others did exactly that, the arrangement was doomed. But was that simply American overspending — or a trap built into the very idea of a national reserve currency? There was a road not taken at Bretton Woods, and the flaw itself had a name. Both come next.

Key takeaways

A world reserve currency is the money other nations hold and trade in; the role passed roughly Portugal → Spain → the Dutch → France → Britain → the US.
At Bretton Woods (1944) the dollar became the reserve, pegged to gold, with other currencies pegged to the dollar.

Check yourself

What is a world reserve currency?

What did the Bretton Woods system establish in 1944?

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