We examine the interaction of economic and policy uncertainty in a dynamic, heterogeneous firms model.Uncertainty about foreign income, trade protection and their interaction dampens export investment.This can be mitigated by trade agreements, which are particularly valuable in periods of increased demand volatility.We use firm data to establish new facts about U.S. export dynamics in 2003-2011 and estimate the model.We find a significant role for uncertainty in explaining the trade collapse in the 2008 crisis and partial recovery in its aftermath.Consistent with the model predictions, we find that the negative effects worked (1) through the extensive margin, (2) in destinations without preferential agreements with the U.S. (accounting for over half its trade) and (3) in industries with higher potential protection.U.S. exports to nonpreferential markets would have been 6.5% higher under an agreement-equivalent to an 8% foreign GDP increase.These findings highlight and quantify the value of international policy commitments through agreements that mitigate uncertainty, particularly during downturns.
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