The petrodollar arrangement

On August 15, 1971, Richard Nixon went on television and ended dollar-gold convertibility. For twenty-seven years the Bretton Woods system had promised that any foreign central bank holding dollars could, at any time, exchange them for gold at $35 an ounce. Vietnam War spending, Great Society programs, and a US gold reserve that had drained from twenty thousand tons in 1950 to roughly eight thousand by 1971 made the promise impossible to honor. Nixon broke it on a Sunday evening. By Monday morning the dollar had become the first major reserve currency in history backed by nothing but the word of a single government. Within two years the entire Bretton Woods architecture had dissolved. By 1973 the dollar was in serious trouble — its purchasing power falling, OPEC was about to quadruple oil prices in retaliation for US support of Israel in the Yom Kippur War, and the question every foreign treasury was asking was the obvious one: why should anyone continue to hold this currency at all?

The answer was engineered, not discovered. In June 1974, Treasury Secretary William Simon and Secretary of State Henry Kissinger traveled to Riyadh and met with King Faisal. The deal they reached was the deal of the century. Saudi Arabia agreed to three things and the United States agreed to one. The Saudis would price all oil exports exclusively in US dollars. The Saudis would recycle their dollar surpluses by purchasing US Treasury bonds — under a secrecy arrangement so unusual that Saudi holdings were hidden from public disclosure for the next forty-one years, until forced into the open in 2016. The Saudis would use their influence in OPEC to bring the rest of the cartel into the dollar regime. In exchange, the United States guaranteed Saudi security against external threats, supplied advanced weapons systems, and effectively underwrote the Saudi royal family’s continued rule. By 1975, every OPEC nation was pricing its oil in dollars. The petrodollar was born.

What this arrangement accomplished is so subtle that most economic education ignores it entirely. Before 1974, the dollar’s reserve status depended on its convertibility to gold. After 1974, it depended on something more durable: every nation on Earth that wanted to import oil first had to obtain dollars. A French refinery in Marseille could not pay the Saudis in francs. A Japanese utility could not pay in yen. A German chemical plant could not pay in marks. Each had to first convert its national currency into dollars on the foreign exchange market — and then use those dollars to settle the oil purchase. The dollar was no longer backed by metal. It was backed by the operational necessity of every industrial economy on the planet. That is a far stronger foundation than gold ever was, because gold can be hoarded by adversaries. The need for oil cannot.

The recycling mechanism is the part most people miss. Oil-exporting nations earn dollar surpluses they cannot easily spend domestically — you cannot pave Riyadh with dollars, you can only buy things with them. The Saudis, and after them every other major oil exporter, invested those surpluses in US Treasury bonds. That single decision had a magical consequence: every barrel of oil sold for dollars eventually financed US government borrowing at below-market yields. The Treasury could run deficits that the laws of economics would normally have punished with a currency crisis, because the world’s oil consumers were continuously generating demand for dollars, and the world’s oil producers were continuously parking those dollars back into Treasuries. The Federal Reserve gained the ability to print without inflating-out, and the United States Treasury gained the ability to borrow without crowding-out. France’s Valéry Giscard d’Estaing had called this “exorbitant privilege” in 1965. In 1974 it became a permanent feature of the international system.

The instrument above lets you watch the four-step loop, walk the timeline from Bretton Woods to the present, see the slow erosion of dollar dominance in oil settlement, and simulate what happens to American power if the petrodollar arrangement ends. Take the time. The mechanics are not difficult but they are unfamiliar, and they explain more about American foreign policy than most foreign-policy textbooks do.

Now understand what this means for everything else. The reason the United States can run a federal debt of $34 trillion without the dollar collapsing is not American virtue, not American productivity, and not American military supremacy in any direct sense. It is the structural demand for dollars created by the global oil market. The reason American sanctions are devastating is that every bank in the world needs dollar access to participate in oil trade, and any bank cut off from dollar correspondent relationships effectively cannot do international business. The reason the Federal Reserve is, in practice, the central bank of the world is that the unit of account in the most important commodity market on the planet is the dollar. Take away the petrodollar and you have not taken away a flag or a symbol. You have removed the operational substrate on which American financial power runs.

The cracks are now measurable. In March 2023, Saudi Aramco began accepting yuan payment from Chinese refiners for selected cargoes — small in volume, immense in symbolism. After Western sanctions in 2022, Russia began selling oil to India in rupees and to China in yuan, settling tens of billions outside the dollar system. The BRICS bloc expanded in 2024 to add the United Arab Emirates, Iran, and Egypt — three significant energy exporters — alongside an active project, mBridge, to enable direct central-bank settlement among China, Thailand, the UAE, and Saudi Arabia without ever touching the dollar rails. And in June 2024, the original fifty-year US-Saudi security framework signed under Nixon expired. Reporting on the successor arrangement indicates that, for the first time since 1974, it contains no exclusivity clause on dollar pricing of Saudi oil. The Saudis did not announce this. They simply stopped requiring it.

What would the full end of the petrodollar mean? The numbers are large and the direction is unambiguous. Reasonable economic modeling suggests the dollar would weaken twenty to forty percent against a basket of trading partners over the following decade as structural demand for dollar reserves contracted. US Treasury yields would rise sharply — perhaps two to three percentage points on the ten-year — as foreign central banks reduced their Treasury holdings in favor of yuan-denominated, euro-denominated, and gold instruments. American consumer prices would rise meaningfully as a weaker dollar increased the cost of imports. And the financial sanctions regime that has been the central instrument of American statecraft for fifty years would lose much of its bite: a nation that does not need dollars to buy oil does not need to fear losing access to dollars. None of this is hypothetical. Each effect has been modeled, observed in partial form, and discussed openly in central-bank research divisions. The only question is the speed.

This is why the petrodollar is the hidden plumbing of American hegemony, and why its erosion is the most consequential geopolitical story almost nobody is teaching. The instruments of American power that voters see — carrier groups, sanctions, foreign aid — are downstream of one engineering decision made in Riyadh in 1974 by two men whose names most Americans do not know. The arrangement they constructed has now begun, quietly, to come apart. It will not collapse in a single day. Reserve currencies dissolve over decades, not weeks. But every barrel of oil that settles in yuan instead of dollars, every BRICS-bloc bilateral swap line, every central-bank gold accumulation, every Aramco contract priced in renminbi is a brick removed from a wall built in 1974 to hold up the United States. The wall is still standing. The bricks are coming out faster than anyone is replacing them. And the building it holds up — the global American century — cannot stand without it.