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Previous estimates of the effects of the Seattle and Denver income maintenance experiments on labor supply indicate that persons eligible for experimental payments reduced their work effort by appreciable amounts. However, these estimates have all been based on data that were self-reported during interviews by participants in the experiment. This paper investigates whether the estimates are biased by differences between treatment and control groups in reporting accuracy. Our results, which utilize employer-reported information on participants' work effort, suggest that the experiment's effects on several categories of Seattle and Denver participants were less adverse than estimates based on self-reported interview data imply.
Greenberg et al. (Sat,) studied this question.
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