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The Welfare Cost of a Current Account Imbalance: A New Channel -- by Jungho Lee, Shang-Jin Wei, Jianhuan Xu

A current account surplus is associated with a welfare loss, according to the existing open-economy macroeconomics literature, only when there are distortions in either savings or investment. We propose a new source of welfare loss even in the absence of such distortions. In particular, a trade surplus, the largest component of a current account surplus for most countries, can alter the shipping costs and the composition of a country's imports and exports in ways that tend to raise the pollution level of the country. Thus, when a country's pollution tax is low, a trade surplus can produce a welfare loss outside the standard channels.
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