Customs Union or Free Trade Area? The Role of Political Asymmetries

When trade policy is determined endogenously by lobbying, it matters whether countries are arranged into a customs union or a free trade area. This paper compares the two regimes when the member governments are asymmetric in their susceptibilities to lobbying and in their bargaining power within a customs union. In the model, a customs union never leads to lower tariffs for both countries, whereas it can lead to higher tariffs for both.