The US dollar is the grease that lubricates the wheels of globalisation. In this much, at least, close observers of the world economy agree. Importers and exporters need a universally-accepted means of payment in which to conduct their transactions. Investors need a vehicle with which to pay for their acquisition of foreign factories and financial assets. Central banks need a form in which to hold their reserves. Official and private users need to be sure that their counterparties, wherever they are located, will accept payment in the proffered form.

And in 2017, the dominant such form is the US dollar.

Indeed, despite the fact that the global financial crisis of 2007-8 originated in the United States, the share of dollars in the foreign exchange reserves of central banks and governments hardly budged, as my coauthors and I show in a new book. The greenback remains the main currency traded in foreign exchange markets. It is still the unit in which petroleum is priced, notwithstanding the complaints of Venezuelan leaders.

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