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Non-technical summaryOne of the clearest signs of the US dollar's dominant international role is its status as the all but exclusive currency used for pricing and settling transactions in global oil markets. The prices of West Texas Intermediate, Brent and Dubai crude are all expressed in dollars. The dollar is used as the unit of account for virtually all benchmark prices. NYMEX, the world's largest oil futures market, provides quotes exclusively in dollars. In the global oil market, whether for spot, term or future contracts and irrespective of country, the dollar reigns supreme.The dominance of the dollar in global oil markets is relevant for several key international economic issues. It is essential to the understanding of the dollar's international status and international currency choice. It has major implications for the degree of exchange rate pass-through of oil and commodity price shocks and for forecasting of domestic inflation. Many models used for policy simulations assume that oil prices are set in dollars.The dollar's dominance as unit of account and means of payment in global oil markets is said to rest on two pillars. One, as with all facets of international currency status, are network effects. In other words, oil prices tend to be expressed and transactions to be settled in dollars because the US remained the largest global oil producer for fully a century, until it was overtaken by the Middle East in the 1950s. Once the practice of expressing oil prices in dollars and settling transactions in that unit became so widespread, and a critical mass of transactions was reached, it was costly for individual buyers and sellers to do otherwise. The second pillar is homogeneity of the product. Because oil is a relatively homogenous commodity, there is substantial convenience in quoting prices in just one currency to facilitate comparisons.The literature on the use of the dollar as the currency of denomination, invoicing and settlement in oil-market transactions is pitched at a high level of generality, however. It tends to be based on stylised rather than closely-observed facts. A major constraint facing empirical work on currency choice in international trade in oil, as in other commodities, goods and services, has been lack of detailed data. Moreover, there has been no meaningful empirical work on choice of currency in the oil market because it is presumed that there is no variation in currency usage in...