Munich Personal RePEc Archive

Policy Measurement and Multilateral Resistance in Gravity Models

Cipollina, Maria Pina and De Benedictis, Luca and Salvatici, Luca and Vicarelli, Claudio (2016): Policy Measurement and Multilateral Resistance in Gravity Models.

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Over the past decade, the gravity equation has emerged as the empirical workhorse in international trade to study the ex-post effects of trade policies on bilateral trade. In this paper we are concerned with the issue of how the econometric specification and the policy measurement choices can affect the goal to obtain accurate estimates of the coefficient associated with bilateral trade policies within a theoretically-consistent model. The problem is even more serious when the policy treatment is approximated through dummies as it is still often the case in the literature. Using a Monte Carlo simulation analysis, this paper shows that the use of fixed effects to control for unobserved heterogeneity leads to biased estimates of the policy impact even when the policy is measured through a continuous variable. The bias highlighted by our results is the combination of measurement error about bilateral trade costs (or preferences) and the specification used to proxy multilateral resistance terms.

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