INTERNATIONAL SUPPLY CHAINS AND THE VOLATILITY OF TRADE

Were the large import fluctuations around the 2007–2009 recession because of increasing trade volatility? I show that import volatility relative to gross domestic product (GDP) increased in the 2000s and examine whether vertical specialization (VS) trade can explain this increase. I develop and calibrate a model of VS trade that generates most of the observed increase in relative import volatility from the 1960s to the 2000s. The increase is because of GDP's shift to less volatile services production. VS trade has a negligible impact. VS causes trade to fall more in recession but also increases the share of output that is traded, leaving volatility unaffected. It increases volatility by shifting trade to more volatile sectors, but this effect is quantitatively small. (JEL E3, F1)