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We model unemployment allowing workers to differ by comparative advantage in market work. Workers with comparative advantage are identified by who works more hours when employed. This enables us to test the model by grouping workers based on their long-term wages and hours from panel data. The model captures the greater cyclicality of employment for workers with low comparative advantage. But the model fails to explain the magnitude of countercyclical separations for high-wage workers or the magnitude of procyclical findings for high-hours workers. As a result, it only captures the cyclicality of the extensive, employment margin for low-wage, low-hours workers.

Zonder onderwerpscode: economie

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This paper assesses biases in policy predictions due to the lack of invariance of "structural'' parameters in representative-agent models. We simulate data under various fiscal policy regimes from a heterogeneous-agents economy with incomplete asset markets and indivisible labor supply. Imperfect aggregation manifests itself through preference shocks in the estimated representative-agent model. Preference and technology parameter estimates are not invariant with respect to policy changes. As a result, the bias in the representative-agent model's policy predictions is large compared to the length of predictive intervals that reflect parameter uncertainty.

Zonder onderwerpscode: economie

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Zonder onderwerpscode: economie