How High Do Income Elasticities Have to Be to Explain the Recent Import Drop-off?

There’s been a debate over the cause of the trade flow drop-off, with varying explanations being offered. Broadly speaking, the explanations are (1) trade credit and credit crunch more broadly, (2) enhanced vertical specialization implying higher income elasticities, and (3) compositional effects (the trade dependent sectors were those most highly affected in the latest recession). Without necessarily offering definitive evidence one way or the other, I wanted to quantify the extent to which income elasticities had to be higher in order to rationalize the movements observed in US data.

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