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Working Paper
Optimal Dynamic Tax-Transfer Policies in Heterogeneous-Agents Economies
When designing an optimal tax-transfer system, the existing literature identifies two key factors: labor efficiency and debt efficiency. The labor-efficiency approach emphasizes the trade-off between redistribution and distortion in the labor market, while the debt-efficiency approach emphasizes the trade-off between monopoly rent gains and distortion in the asset market. In this paper, we propose a third factor for designing optimal tax-transfer policies: the dynamic-efficiency approach. To demonstrate this, we use an analytically tractable infinite-horizon model incorporating both ex-ante ...
Working Paper
Optimal Dynamic Tax-Transfer Policies in Heterogeneous-Agents Economies
In the design of an optimal tax-transfer system, there are two complementary conventional wisdoms: the labor-efficiency argument and the debt-efficiency argument. The former emphasizes the trade-off between redistribution and distortions in the labor market, while the latter emphasizes the trade-off between gains from monopoly rents and distortions in the asset market. We use an analytically tractable infinite-horizon model with both ex-ante and ex-post heterogeneity to show that neither argument is complete in the design of the tax-transfer system. Instead, in Aiyagari-type models the ...
Working Paper
Optimal Dynamic Tax-Transfer Policies in Heterogeneous-Agents Economies
When designing an optimal tax-transfer system, the existing literature identifies two key factors: labor efficiency and debt efficiency. The labor-efficiency approach emphasizes the trade-off between redistribution and distortion in the labor market, while the debt efficiency approach emphasizes the trade-off between monopoly rent gains and distortion in the asset market. In this paper, we propose a third factor to consider when designing optimal tax-transfer policies: the dynamic-efficiency approach. To demonstrate this, we use an analytically tractable infinite-horizon model incorporating ...
Working Paper
Optimal Ramsey Capital Income Taxation —A Reappraisal
This paper addresses a long-standing problem in the optimal Ramsey capital taxation literature. The tractability of our model enables us to solve the Ramsey problem analytically along the entire transitional path. We show that the conventional wisdom on Ramsey tax policy and its underlying intuition and rationales do not hold in our model and may thus be misrepresented in the literature. We uncover a critical trade off for the Ramsey planner between aggregate allocative efficiency in terms of the modified golden rule and individual allocative efficiency in terms of self-insurance. Facing the ...
Discussion Paper
Understanding Heterogeneous Agent New Keynesian Models: Insights from a PRANK
In recent years there has been a lot of interest in the effect of income inequality (heterogeneity) on the economy, from both academics and policymakers. Researchers have developed Heterogeneous Agent New Keynesian (HANK) models that incorporate heterogeneity and uninsurable idiosyncratic risk into the New Keynesian models that have become a cornerstone of monetary policy analysis. This research has argued that heterogeneity and idiosyncratic risk change many features of New Keynesian models – the transmission of conventional monetary policy, the forward guidance puzzle, fiscal multipliers, ...
Working Paper
The Ramsey Steady-State Conundrum in Heterogeneous-Agent Economies
In infinite horizon, heterogeneous-agent and incomplete-market models, the existence of an interior Ramsey steady state is often assumed instead of proven. This paper makes two fundamental contributions: (i) We prove that the interior Ramsey steady state assumed by Aiyagari (1995) does not exist in the standard Aiyagari model. Specifically, a steady state featuring the modified golden rule and a positive capital tax is feasible but not optimal. (ii) We design a modified, analytically tractable version of the standard Aiyagari model to unveil the necessary and/or sufficient conditions for the ...
Working Paper
Uninsurable Income Risk and the Welfare Effects of Reducing Global Imbalances
We highlight the welfare effect of policies that balance global current accounts when households face uninsurable income risk and borrowing constraints. Subsidizing savings in debtor economies reduces current account imbalances and raises the welfare of almost all citizens by increasing world capital, raising wages, and improving insurance for low-wealth households. The same balancing of current accounts is achieved by taxing savings in lender economies; however, this policy hurts most households by reducing global capital. These results suggest that balancing global imbalances may be a ...
Report
Optimal Monetary Policy According to HANK
We study optimal monetary policy in a heterogeneous agent new Keynesian economy. A utilitarian planner seeks to reduce consumption inequality, in addition to stabilizing output gaps and inflation. The planner does so both by reducing income risk faced by households, and by reducing the pass-through from income to consumption risk, trading off the benefits of lower inequality against productive inefficiency and higher inflation. When income risk is countercyclical, policy curtails the fall in output in recessions to mitigate the increase in inequality. We uncover a new form of time ...
Working Paper
Bank Liquidity and Capital Regulation in General Equilibrium
We develop a nonlinear dynamic general equilibrium model with a banking sector and use it to study the macroeconomic impact of introducing a minimum liquidity standard for banks on top of existing capital adequacy requirements. The model generates a distribution of bank sizes arising from differences in banks' ability to generate revenue from loans and from occasionally binding capital and liquidity constraints. Under our baseline calibration, imposing a liquidity requirement would lead to a steady-state decrease of about 3 percent in the amount of loans made, an increase in banks' holdings ...
Working Paper
Low Risk Sharing with Many Assets
Classical contributions in international macroeconomics rely on goods-market mechanisms to reconcile the cyclicality of real exchange rates when financial markets are incomplete. However, cross-border trade in one domestic and one foreign-currency-denominated risk-free asset prohibits these mechanisms from breaking the pattern consistent with complete markets. In this paper, we characterize how goods markets drive exchange rate cyclicality, taking into account trade in risk-free and/or risky assets. We show that goods-market mechanisms come back into play, even when there is cross-border ...