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Recent econometric work and growing analytical consensus suggest that exogenous international market pressures are a contributing factor to trends in U.S. wage/earnings inequality. Trade accounts for a share of these inequality trends close to or somewhat greater than its 10-15 percent share of economic activity, especially over medium-term horizons and dependent on precise definition. Trade is neither a trivial influence nor a dominant one. Evidence exists that its influence has declined slightly in the past decade, however. Rapid technological growth in exportable sectors seems more important.
J. David Richardson (Tue,) studied this question.