Matthew C Klein, Columnist

Currency Wars, Gangnam-Style

How will South Korea react to currency devaluation in Japan?
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(Corrects amount of South Korean exports in description of second chart.)

The U.S. Treasury on Friday issued a warning to Japanese policymakers "to refrain from competitive devaluation and targeting its exchange rate for competitive purposes." The warning was prompted by the Bank of Japan's commitment to a new inflation target and a much larger balance sheet. My colleague Caroline Baum has already noted the strangeness of the U.S. statement, given that the Japanese government is merely doing what U.S. academics have been recommending for more than 15 years.