Petrodollar
The arrangement, dating from the 1970s, by which the world prices and pays for oil in US dollars, anchoring the dollar's global dominance.
Almost every barrel of oil that crosses a border is priced and paid for in US dollars, whether the buyer sits in Beijing, Berlin, or Bangalore. That fact is so routine it feels like a law of physics, but it is one of the quiet foundations of American power. Call it the petrodollar: the arrangement by which the world's most vital commodity trades in the world's reserve currency, generating a constant, built-in demand for dollars and letting Washington borrow on terms no other country enjoys.
Born from a crisis
The system grew out of the wreckage of 1971. Once Nixon severed the dollar from gold, the currency needed a fresh source of demand, and Saudi oil supplied it. The 1973 Arab oil embargo quadrupled crude prices and buried the exporters in cash. In 1974, with Henry Kissinger handling the diplomacy, the US reached an understanding with Saudi Arabia: the kingdom would keep pricing its oil in dollars and recycle its surpluses into US Treasury bonds and American weapons, and in return Washington would guarantee the security of the House of Saud. There was never a single signed 'petrodollar treaty', despite a persistent myth about a secret 50-year pact that supposedly lapsed in 2024. What existed was a web of deals, including a genuinely secret 1974 arrangement for Saudi Arabia to buy Treasuries outside the normal auctions.
Why it matters
The payoff for America was enormous. Because oil importers everywhere need dollars to fill their tanks, they hold dollars, buy dollar assets, and keep US borrowing cheap. Recycled petrodollars helped finance American deficits for decades; by the late 1970s Saudi Arabia alone held roughly a fifth of all foreign-owned US Treasuries. Economists call this the dollar's exorbitant privilege, the near-magical ability to buy real goods from the rest of the world with paper the US can always print more of. The system also handed Washington a weapon: shut a country out of the dollar network, as sanctions did to Iran and Russia, and you shut it out of much of global trade.
The cracks
Nothing about the petrodollar is written into law, which is why talk of 'de-dollarization' keeps returning. The BRICS group floats settling trade in local currencies, China has pressed Saudi Arabia to take yuan for some crude, and Russia, sanctioned in 2022, now sells oil for rubles, yuan, and rupees. The drift is real but slow: roughly 80 percent of oil trade still clears in dollars, and no rival offers the depth, safety, and openness of US markets. The petrodollar endures less because of any contract than because, for now, everyone else still wants dollars too. The day that stops being true, a large share of America's financial reach goes with it.