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We study the optimal design of means-tested transfers and progressive income taxes. In a simple analytical model, we demonstrate an optimally negative relation between transfers and income-tax progressivity due to efficiency and redistribution concerns. In a rich dynamic model, we quantify the optimal plan with flexible tax-and-transfer functions. Transfers should be larger than currently in the U.S. and financed with moderate income-tax progressivity. Transfers are key to implement higher progressivity in average than in marginal tax-and-transfer rates, achieving redistribution while preserving efficiency. Quantitatively, the left tail of the income distribution determines optimal transfers, whereas the right tail determines income-tax progressivity.

This paper investigates how government spending multipliers depend on the distribution of taxes across households. We exploit historical variations in the financing of spending in the U.S. since 1913 to show that multipliers are positive only when financed with more progressive taxes, and zero otherwise. We rationalize this finding within a heterogeneous-household model with indivisible labor supply. The model results in a lower labor responsiveness to tax changes for higher-income earners. In turn, spending financed with more progressive taxes induces a smaller crowding-out, and thus larger multipliers. Finally, we provide evidence in support of the model's cross-sectional implications.

This paper analyzes optimal fiscal policy with ambiguity aversion and endogenous government spending. We show that without ambiguity, optimal surplus-to-output ratios are acyclical and that there is no rationale for either reduction or further accumulation of public debt. In contrast, ambiguity about the cycle can generate optimally policies that resemble “austerity” measures. Optimal policy prescribes higher taxes in adverse times and front-loaded fiscal consolidations that lead to a balanced primary budget in the long run. This is the case when interest rates are sufficiently responsive to cyclical shocks, that is, when the intertemporal elasticity of substitution is sufficiently low. (JEL D81, E32, E43, E62, H21, H61, H63)

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