Decades of trade deficits and a strong dollar created too many “losers” in the U.S. economy who turned to Donald Trump’s protectionist policies, according to Richard Koo, chief economist at the Nomura Research Institute — and those conditions remain.

“When we studied economics and free trade, in particular, we were taught…that free trade always creates both winners and losers in the same economy, but the gain that winners get is always greater than the loss of the losers, so the society as a whole always gains. So that’s why the free trade is good,” he noted.

Koo nevertheless argued that this rests on the assumption that trade flows are balanced or in surplus, while the U.S. has been running huge deficits for the last forty years, which have expanded the number of “losers.”

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