Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
This paper examines the diversification motive for tariffs under trade-related uncertainty when there is incomplete international and domestic risk sharing. In the context of a two-country Ricardian continuum-of-sectors model with shocks to foreign technologies or preferences, tariffs allow a country to mitigate external risk by diversifying across sectors. Given sufficiently high risk and risk aversion, the optimality of tariffs depends primarily on a country's ability to diversify, rather than its market power, such that small countries gain most.