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Author:Zhang, Yuzhe 

Journal Article
Wealth Effects with Endogenous Retirement

In this article, we study wealth effects, i.e., the response of consumption to exogenous changes in wealth. We use a consumption-saving model with endogenous retirement to show that the endogenous response of the value of a worker's human capital to changes in her wealth helps to account for the weak wealth effects observed in the data.
Economic Quarterly , Issue 3Q , Pages 173-200

Journal Article
Unemployment insurance: payments, overpayments and unclaimed benefits

In the U.S. unemployment insurance program, most of the overpayments due to fraud arise from individuals collecting benefits while they are gainfully employed. In addition, the overpayments are dwarfed by payments unclaimed by some who are eligible for unemployment benefits.
The Regional Economist , Issue Oct , Pages 12-13

Working Paper
Stochastic optimal growth with a non-compact state space

This paper studies the stability of a stochastic optimal growth economy introduced by Brock and Mirman [J. Econ. Theory 4 (1972)] by utilizing stochastic monotonicity in a dynamic system. The construction of two boundary distributions leads to a new method of studying systems with non-compact state space. The paper shows the existence of a unique invariant distribution. It also shows the equivalence between the stability and the uniqueness of the invariant distribution in this dynamic system.
Working Papers , Paper 639

Journal Article
Optimal Institutions in Economies with Private Information: Exclusive Contracts, Taxes, and Bankruptcy Law

In economies with private information, it is typically optimal to prohibit or otherwise discourage a subset of trades that individual agents want to enter. Economists often refer to such optimal distortions as wedges. In this article, we use a simple private-information Mirrleesian economy to, first, show examples of these wedges and, second, discuss institutions that may be used to implement them in practice. We discuss and compare three such institutions: exclusive contracts, taxes, and bankruptcy law. Our analysis underscores the multiplicity of possible implementations and, therefore, the ...
Economic Quarterly , Issue 4Q , Pages 353-385

Working Paper
Optimal Incentive Contracts with Job Destruction Risk

We study the implications of job destruction risk for optimal incentives in a long-term contract with moral hazard. We extend the dynamic principal-agent model of Sannikov (2008) by adding an exogenous Poisson shock that makes the match between the firm and the agent permanently unproductive. In modeling job destruction as an exogenous Poisson shock, we follow the Diamond-Mortensen-Pissarides search-and-matching literature. The optimal contract shows how job destruction risk is shared between the rm and the agent. Arrival of the job-destruction shock is always bad news for the rm but can be ...
Working Paper , Paper 17-11

Working Paper
Optimal Contracts with Reflection

In this paper, we show that whenever the agent's outside option is nonzero, the optimal contract in the continuous-time principal-agent model of Sannikov (2008) is reflective at the lower bound. This means the agent is never terminated or retired after poor performance. Instead, the agent is asked to put zero effort temporarily, which brings his continuation value up. The agent is then asked to resume effort, and the contract continues. We show that a nonzero agent's outside option arises endogenously if the agent is allowed to quit and find a new firm (after a random search time of finite ...
Working Paper , Paper 16-14

Journal Article
Saving for Retirement with Job Loss Risk

This article studies a tractable theoretical model of optimal consumption and saving decisions with endogenous retirement. Particular attention is paid to the impact of an increase in the risk of losing one?s job on the optimal path of consumption and wealth accumulation. Even if one does not actually lose their job, an increase in the risk of a job loss is by itself sufficient to cause lower consumption, higher saving, and, through faster retirement, lower labor supply.
Economic Quarterly , Issue 1Q , Pages 45-81

Journal Article
Who is concealing earnings and still collecting unemployment benefits?

Concealed earnings represent the largest source of fraud in the U.S. unemployment insurance system. Individuals with relatively low earnings constitute a larger fraction of those committing such fraud. High-earnings individuals, however, account for larger dollar amounts of this fraud.
The Regional Economist , Issue Apr

Journal Article
Unemployment insurance fraud

Concealed Earnings fraud accounts for almost two-thirds of the total overpayments due to all fraud.
Economic Synopses

Briefing
The Differing Effects of the Business Cycle on Small and Large Banks

Small banks and large banks respond differently to business cycle fluctuations. The average net interest margin (NIM) at large banks is negatively correlated with the business cycle, while the average NIM at small banks is positively correlated with the business cycle. In a popular view, small banks are different from large banks because of their close relationships with their borrowers. But a decomposition of the cyclical properties of NIM into the asset and liability sides of the balance sheet suggests that small banks' procyclical NIM is due to their ability to keep funding costs less ...
Richmond Fed Economic Brief , Issue November

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Grochulski, Borys 9 items

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