The Petrodollar Explained: History, How It Works and Its Future

Introduction

The petrodollar is one of the most important ideas in the world of finance but it is not properly understood (ref. 6) Since the 1970s, the US dollar has been very influential in the oil trade, sanctions and the economic systems of different countries. (ref. 3)

The term ‘petrodollar’ is frequently used in politics and global economics, what is unclear are: the origins of the petrodollar system, why the petrodollar became important and the effects of the petrodollar globally (ref. 6)

In recent years, there has been debate about the future of the petrodollar. Countries like China and Russia have formed alliances such as the BRICS group to encourage trade between member countries using local currencies and not rely on the US Dollar when purchasing oil (Ref. 7)

This article explains the history of the petrodollar system, how it works, its advantages and criticisms, and the developments that may shape its future. Whether you are a student, investor or simply interested in global economics, understanding the petrodollar provides valuable insight into one of the foundations of the modern international financial system.

What is the Petrodollar?

A petrodollar is a U.S. dollar that is received by an oil producer in exchange for selling oil and that dollar is then deposited in Western banks. (ref 1)

Why Was the Petrodollar Created?

The collapse of Bretton Woods

In July 1944, the Bretton Woods monetary system existed wherein countries that wanted to acquire gold had to convert their currencies into US dollars and use those dollars to purchase gold. (ref. 1, p.52-53). However, over the following decades, the US government’s spending on public services and the Vietnam war became excessive and this made other countries distrust the US government’s ability to control its finances so countries started converting their US dollar reserves back into gold. With the US dollar no longer being backed by gold, there was a fear that global demand for US dollars would decline and the US dollar’s value would decline. In 1971, President Richard Nixon ended the U.S. dollar’s convertibility into gold, bringing the Bretton Woods monetary system to an end. (ref. 1, p.58-63)

The problem facing the United States

The U.S. government needed a way to preserve international demand for the dollar. If countries stopped holding large reserves of dollars, the dollar could weaken and it would become more difficult for the United States to finance government spending and budget deficits. (ref. 1, p.55, 59, 66)

The solution: oil replaces gold

According to the book, U.S. officials, particularly President Nixon and Secretary of State Henry Kissinger, negotiated an agreement with Saudi Arabia in the early 1970s. (ref. 1, p.67, 68)

The agreement was based on two key conditions:

1. Saudi Arabia would sell its oil exclusively in U.S. dollars. (ref. 1, p.68)
2. Saudi Arabia would invest much of US dollars it has acquired from its surplus oil revenue into U.S. government debt e.g. US Government bonds (ref. 1, p.55, 68)

In return, the United States offered:

• Military protection
• Arms sales
• Security assistance for Saudi Arabia and its oil infrastructure (ref. 1, p.68)

Expansion to OPEC

Once Saudi Arabia accepted the arrangement, other OPEC members gradually adopted the same system. By the mid-1970s, most major oil-exporting countries were pricing their oil in U.S. dollars and investing a portion of their oil revenues in U.S. financial assets e.g. US Government bonds. (ref. 1, p.55, 69)

The result

Because every country needs oil, countries around the world had to acquire U.S. dollars in order to purchase it. This created continuous international demand for dollars, helping the dollar remain the world’s dominant reserve currency even after it was no longer backed by gold. (ref. 1, p.69)

Other effects of the Petrodollar are: that is makes the US dollar more valuable if there is constant global demand for it and it makes it easier for the US government to borrow money from foreign countries and private investors who have accumulated US dollars and invest those dollars into US Treasury bonds, banks, stocks, and other financial assets, a process known as petrodollar recycling(Ref. 2)

How the Petrodollar System Works

The petrodollar system works by creating a cycle in which oil is traded in US dollars and those dollars flow back into the US financial system. (ref. 2)

Step-by-step

1. Oil is priced and sold in US dollars
2. Oil-importing countries buy US dollars by converting their own currency for US dollars. They then use those US dollars to buy oil from oil-exporting countries.
3. Oil exporting countries like the Saudi Arabia, the UAE, or Kuwait receive large amounts of these dollars from oil sales. These US dollars are called Petrodollars.
4. These oil-exporting countries often invest their dollars into US Treasury bonds, stocks, bank accounts etc. This process is known as petrodollar recycling.
5. The cycle repeats where the recycled Petrodollars provide funds for the US government to borrow money from (via Petrodollars being invested into US government bonds) and supports US financial markets (where the Petrodollars are invested in US company stocks and US bank accounts). At the same time, countries need US dollars to purchase oil so the dollar increases in value. (ref. 2)

Benefits of the Petrodollar System

• Global oil trade in U.S. dollars: Since the 1970s, most international oil transactions have been conducted in U.S. dollars so this creates a demand for the U.S. dollar. (ref. 3)
• Recycling of petrodollars: Countries that sell oil often invest the U.S. dollars they have earned into in U.S. Treasury securities (e.g. Treasury Bills, Treasury Notes, Treasury Bonds etc) to keep them safe while earning interest for some of those U.S Treasury securities (ref. 6). This process, called petrodollar recycling, helps finance the U.S. government’s budget. (ref. 3)
• Increased demand for U.S. dollars: countries that trade oil for U.S. dollars increase demand for the US dollar and help maintain its status as the world’s primary reserve currency. (ref. 3)
• Lower borrowing costs for the U.S.: The increased demand for U.S. Treasury securities from oil-exporting countries helps keep U.S. interest rates lower than they might otherwise be, benefiting the U.S. government and consumers. That’s because as bond prices rise, their yields naturally fall. (ref. 3 and ref. 7)
• Geopolitical influence: The petrodollar system allows the U.S. to persuade and greatly influence the countries that trade oil as these countries rely on the stability of the U.S. dollar and its value. (ref. 3)

Criticisms and Challenges

There are risks associated with the petrodollar system. If oil-exporting countries decide to trade oil with currencies other than US dollars or if they decide to invest their currencies in other assets not owned by the US Government, that could weaken demand for the U.S. dollar and make the US dollar appear less valuable. This could result in escalating geopolitical tensions between the U.S. and those oil-exporting countries as these countries are aiming to reduce their dependence on the U.S. dollar. (ref. 3)

An example of this is in 2018, when China launched its first crude oil futures contract valued in yuan to create the “petroyuan” as a rival to the petrodollar system. (ref. 3)

Russia has also been working to reduce its dependence on the U.S. dollar, when President Vladimir Putin stated in 2019 that the country was aiming to “de-dollarize” its economy. Putin’s plan to not rely on the US dollar helped reduce the damaging effects of the US sanctions on Russia when Russia invaded Ukraine in 2022. (ref. 3)

Iran and Venezuela, in response to U.S. sanctions on its economies in the past few years, have traded oil using currencies that are not US dollars. Iran has accepted euros, yuan, and other currencies to trade oil, while Venezuela has traded oil using the euro and the Chinese yuan. (ref. 3)

Oil demand is expected to decrease over time as the world moves toward renewable energy sources which could eventually lead to a reduction in petrodollar flows as the demand for oil decreases. (ref. 3)

Following the first U.S.-Israeli attack on Iran and the Middle East, Iran occupied the Strait of Hormuz, through which cargo ships and oil tankers pass through. Industry experts have said some ships are able to pass through the Strait of Hormuz by paying in Chinese yuan. (ref. 4)

According to economists, Gulf countries have been trading oil without using the US dollars for years prior to the current conflict in the Middle East, weakening the petrodollar system. (ref. 4)

Recent Developments

During the Iran war, Iran occupied the Strait of Hormuz, and by occupying the Strait of Hormuz, it could send a message to other countries that there are other currencies that can be used to trade in oil and not the petrodollar. If the U.S. gains control of the Strait of Hormuz, the petrodollar will likely stay important to oil trade. (ref. 4)

Common Myths and Misconceptions

As of now, the U.S. is a net oil exporter, not an importer of oil and doesn’t rely on Saudi supply of oil. The Saudis today issue of dollar-denominated bonds. (ref. 5)

Frequently Asked Questions

Is the Petrodollar a Currency?

No, petrodollars are U.S. dollars received in exchange for selling oil. The reinvestment of dollars received from oil exports has sometimes been called petrodollar recycling.

Does the U.S. Dollar’s Global Role Depend on Its Use to Settle Oil Sales?

No, the U.S. dollar is used for oil sales because it is widely used around the world. That acceptance makes it easier for oil traders to reinvest the dollars they received from oil selling.

Is the Petroyuan in Sight?

The Petroyuan is not as dominant as the petrodollar. Accepting Chinese currency would be most useful for investing and buying in China. Chinese currency is not widely accepted in countries outside China.

Are Petrodollars Fueling War and Oppression?

Saudi Arabia has been accused of human rights violations and Russia’s invasion of Ukraine have led to suggestions that those countries’ rulers are able to do these ethically wrong acts because of the wealth and power they gain from the petrodollar system.

Did Saudi Arabia Drop the Petrodollar?

In June 2024, there were online rumors that Saudi Arabia was refusing to renew its 50-year deal with the U.S. to price its oil in US dollars. Before the rumors were debunked by experts pointing out that there was never a formal agreement with a fixed expiration date, online Google searches for the term “petrodollar” spiked and people began concluding that the U.S. dollar’s role as the world reserve currency was over and that its economy could face turmoil. (ref. 2)

Conclusion

Petrodollars play a vital role in global trade and finance. The US dollar is the most important currency in the world due to the fact many countries use the US dollar for trading oil. Despite the existence of alternative currencies to challenge the dominance of the US dollar in oil trade, like the petroyuan, the likelihood of the U.S. dollar losing its role as currency used in global oil trade and as the world’s reserve currency remains low in the near future. (ref. 2)

Sources

Ref 1) Jerry Robinson, Bankruptcy of our nation, revised and expanded edition, July 2012, page 66-67

Ref 2) https://www.investopedia.com/terms/p/petrodollars.asp

Ref 3) https://www.investopedia.com/articles/forex/072915/how-petrodollars-affect-us-dollar.asp

Ref 4) https://fortune.com/2026/04/07/what-is-petrodollar-petroyuan-saudi-china-dollar-strength/

Ref 5) https://www.cfr.org/articles/petrodollars-myths-and-reality

Ref 6) https://www.sofrrate.com/treasury-rates

Ref 7) https://www.investopedia.com/articles/bonds/07/price_yield.asp