[There are many articles (including one I wrote in college), and even whole books written about Petrodollars – the way that US dollars dominate the world economy by their crucial involvement in all global oil trades. This just happens to be a very clearly written and accessible essay, so I’m reprinting it despite slightly out-of-date numbers. The extent to which the fragility of petrodollar hegemony affects US foreign policy is probably the biggest question mark, but it seems plausible that the much-threatened aggression against Iran has a lot to do with that country’s moves to abandon the dollar for their oil trades. – alex]
Oil prices and the dollar
C. P. Chandrasekhar
Jayati Ghosh
Originally published by Business Line, February 26, 2008.
| The depreciation of the US dollar has been closely bound up with the movement of oil prices, as world oil trade is typically denominated in dollars. Yet this relationship may now be under threat as the dollar continues to depreciate and the US economy tips into recession. In this edition of Macroscan, C. P. Chandrasekhar and Jayati Ghosh examine how oil prices have changed with different numeraires, and consider the implications for the future of the oil-dol lar nexus. |
The relationship between oil and the US dollar has been at the heart of the way international economic relations have been organised for more than half a century.
International capitalism has relied on the US dollar as the basic reserve currency, and has therefore granted it an essential degree of stability for several decades despite the large external deficits run by the US and the periodic swings in its valuation in currency markets.
More than half of aggregate world exports are denominated in dollars; more than 80 per cent of all international currency transactions similarly involve dollars.
Loans made by the IMF and other multilateral institutions are denominated in dollars. More than 60 per cent of the foreign exchange reserves held by central banks of all countries are in dollar assets.
This has obviously meant huge advantages for the US. It has allowed the US economy to benefit from access to imports that can effectively be paid for simply by printing dollars, and has therefore allowed the US to run enormous current account deficits for prolonged periods. It has encouraged the rest of the world to finance these deficits by providing its savings to be held in US or dollar-denominated financial assets, to the point that all the developing regions of the world are also building dollar reserves that directly or indirectly find their way to the US economy.
Dollarisation of oil markets
A key feature of this entire process has been the dollarisation of world oil markets. Oil is the central commodity of industrial capitalism, absolutely essential for the production of essential and widely used goods. All industrial economies, and most developing ones, would grind to a halt with even a moderate disruption of oil supplies.
Most of the world oil trade has operated and continues to operate in dollars, even when the US is not the trade partner. Oil prices are defined in dollars for most oil exporters. As a result, oil importing countries also pay in dollars. The oil-exporting countries accumulate dollar reserves, which have been preferentially invested back in the US because of the zero currency risk involved in this.
Indeed, this recycling of petrodollars has been very significant as a source of finance for US trade deficits in several periods, including in recent times. Other countries also hold dollars for future oil purchase.

The dramatic increase in the price of oil in the past few years could be argued to have accentuated this tendency. As Chart 1 indicates, oil prices have increased dramatically in dollar terms especially from 2003, going up by nearly 2.5 times between 2003 and 2007.
This has obviously contributed very significantly to the wealth of oil exporters, and allowed them to generate balance of payments surpluses and build foreign exchange reserves, which have then been invested dominantly in dollar assets in US markets.
However, this is also the period that the US dollar has been depreciating, especially with respect to some of the other major currencies such as the euro and the Japanese yen. As a result, the change in oil prices has been less striking in terms of these currencies than in terms of the dollar.
The currency factor
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