INTEREST GROUPS,ELECTORAL COMPETITION,AND PROBABILISTIC VOTING FOR TRADE POLICIES*

Current models of trade policy formation in representative democracies lack the micro foundations from which the political actions of voters, interest groups, and policy makers can be deduced. This paper provides microfoundations for the most influential of representative democracy models, the Magee-Brock-Young (MBY) model. Probabilistic voting is formally introduced, the conditions for active lobbying are examined, uniqueness of lobbying equilibrium is established, and the responses of different groups' lobbying to exogenous changes are discussed. Finally, the existence of tariff equilibria is studied when, different from MBY, both parties share a common strategy space.