In the US unemployment insurance (UI) system, only a fraction of those eligible for benefits actually collect them. We estimate this fraction using CPS data and detailed state-level eligibility criteria. It averaged 77% from 1989 − 2012 and is negatively correlated with the unemployment rate. These empirical facts are explained in an equilibrium search model where firms finance UI benefits and are heterogeneous with respect to their specific tax rate, which is experience rated. In equilibrium, low tax firms effectively offer workers an alternative UI scheme featuring a faster job arrival rate and a higher wage offer. Some eligible workers prefer the "market" scheme and thus do not collect UI. The model captures the negative correlation between the take-up and unemployment rate. If all eligible unemployed collect, benefit expenditures increase by 16% and welfare increases. Average search effort decreases, but the unemployment rate and duration decrease as vacancy creation increases.

An important incentive problem for the design of unemployment insurance is the fraudulent collection of unemployment benefits by workers who are gainfully employed. We show how to efficiently use a combination of tax/subsidy and monitoring to prevent such fraud. The optimal policy monitors the unemployed at fixed intervals. Employment tax is nonmonotonic: it increases between verifications but decreases after a verification. Unemployment benefits are relatively flat between verifications but decrease sharply after a verification. Our quantitative analysis suggests that the optimal monitoring cost is 60 percent of the cost in the current US system. (JEL D82, H24, J64, J65)

In this paper, we investigate the causes and consequences of “unclaimed” unemployment insurance (UI) benefits. A search model is developed where the costs to collecting UI benefits include both a traditional “fixed” administrative cost and an endogenous cost arising from worker and firm interactions. Experience rated taxes give firms an incentive to challenge a worker's UI claim, and these challenges are costly for the worker. Exploiting data on improper denials of UI benefits across states in the U.S. system, a two‐way fixed effects analysis shows a statistically significant negative relationship between the improper denials and the UI take‐up rate, providing empirical support for our model. We calibrate the model to elasticities implied by the two‐way fixed effects regression to quantify the relative size of these UI collection costs. The results imply that on average the costs associated with firm challenges of UI claims account for 41% of the total costs of collecting, with improper denials accounting for 8% of the total cost. The endogenous collection costs imply the unemployment rate responds much slower to changes in UI benefits relative to a model with fixed collection costs. Finally, removing all eligibility requirements and allowing workers to collect UI benefits without cost shows these costs to be 4.5% of expected output net of vacancy costs. Moreover, this change has minimal impact on the unemployment rate.

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A model of optimal unemployment insurance with adverse selection and moral hazard is constructed. The model generates both qualitative and quantitative implications for the optimal provision of unemployment insurance. Qualitatively, for some agents, incentives in the optimal contract imply consumption increases over the duration of non-employment. Calibrating the model to a stylized version of the U.S. economy quantitatively illustrates these theoretical predictions. The optimal contract achieves a welfare gain of 1.94% relative to the current U.S. system, an additional 0.87% of gains relative to a planner who ignores adverse selection and focuses only on moral hazard.