Abstract
This paper develops a heterogeneous agent model with equilibrium unemployment and economic profits due to productive public investment. We find that the presence of profits plays an important role in the determination of long-run optimal tax policy. The Judd-Chamley optimal zero capital tax result can still hold in the model without profits. In this case, the optimal labour wedge is zero in the long run, resulting in welfare gains for all agents and no conflict of interests between agents. But the Benthamite government chooses to subsidise capital income in the long run in the model with economic profits. The resulting labour wedge is non-zero which generates welfare losses of workers despite welfare gains of capitalists. The government also faces a trade-off between efficiency and equity in this case.
Acknowledgements
I would like to thank Konstantinos Angelopoulos, Jagjit Chadha, Jilei Huang, Miguel León-Ledesma, James Malley, and participants and discussants at the University of Glasgow seminar, University of Kent Internal Workshop, China Meeting of the Econometric Society in Beijing and Royal Economic Society Annual Conference at Manchester. I would also like to thank the anonymous referee for helpful comments and suggestions. The remaining errors are mine.
A Appendix
A.1 Optimisation problem of capitalists
The optimisation problem of the capitalist can be expressed mathematically as follows:
The Lagrangian function of the capitalist is then written as:
where ξt is the Lagrangian multiplier on the capitalist’s budget constraint.
The first-order condition (FOC) for
The FOC for
Consolidating these two FOCs yields the following equation:
A.2 Optimisation problem of workers
The optimisation problem for the worker is shown as follows:
The Lagrangian function of the worker is written as:
where ϕt is the Lagrangian multiplier on the worker’s budget constraint.
The FOC for
The FOC for
These two FOCs are next combined into one equation as follows:
which can be re-written as:
A.3 Optimisation problem of firms
The optimization problem for the firm can be summarized in the following:
The Lagrangian function of the firm is written as:
The FOC for
The FOC for
A.4 The DCE conditions
The DCE consists of the following conditions:
A.5 Derivation of ζi
ζi satisfies the follow equation implying that the agent i is as well off in the exogenous policy model as in the Ramsey model.
We can solve for ζi in the equation above by taking the following algebra:
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