Ben’s bind

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: currencies. And the correlation between changes in the price of oil and the euro/dollar exchange rate has risen even when oil is priced in a basket of currencies, such as the IMF’s special drawing rights.

So is the weaker dollar driving oil prices up or are high oil prices driving the dollar down? The Goldman analysts argue the latter. Dearer oil is pushing the dollar down, they claim, because oil exporters import more from Europe than America and hold less of their oil revenues in dollars. A second factor lies with central banks. Because the Fed focuses on “core” inflation (which excludes food and fuel), whereas the ECB targets overall inflation, America’s central bank runs a looser policy in response to higher oil prices, thus pushing the dollar down.

Another reason to suspect that the Fed is more than a bit player is that American interest-rate decisions have a disproportionate effect on global monetary conditions. Some emerging economies still peg their currencies to the dollar; many others have been reluctant to let their exchange rates rise enough to make up for the dollar’s decline. As a result, monetary conditions in many emerging markets remain too loose. This fuels domestic demand, pushing up pressure on prices, particularly of commodities. All of which suggests that the Fed’s decisions are propagated widely through the dollar.

The most recent circumstantial evidence also suggests that the Fed may bear some responsibility for the commodities boom. The dollar slipped after the Fed’s rate-cut decision as investors reacted to its doveish tone, though at $1.56 per euro, it was still up 2.6% from its low of $1.60 on April 22nd. The price of oil, after hitting a record high of almost $120 a barrel on April 28th, had tumbled to $113 on April 30th. But the price of crude and other commodities rose afterwards. If those reactions persist, America’s central bankers may have to reflect carefully.