International mobility of capital, wage indexation, and the cost of policy mistakes under ambiguity: a CGE evaluation

In this paper we focus on the role institutions and structural parameters play in macroeconomic policy design and test the differential effects of tax policies on two structural parameters: the degree of international capital mobility and the rules of wage indexation practiced in the economy. We evaluate counterfactual changes in taxation in the Argentine economy using a Computable General Equilibrium (CGE) Model with unemployment, calibrated with 2006 data, showing that policy mistakes (diagnosis failures) are costlier when the degree of capital mobility is greater and the rules to determine salaries could amplify the losses. Among other taxes, we evaluate the choice of export taxation, historically one of the preferred revenue sources of Argentine governments. We discuss the choice of taxes that an optimistic and a pessimistic policymaker will make under Knightian uncertainty and find that, in the case of our CGE, an optimistic policymaker prefers to tax export goods, while a more pessimistic one tends to tax imports or non-tradable goods.