Donald R. Williams

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Many self-employed workers return to the wage and salaried sector of the labor market after some time. It is possible that the self-employment spell will lead to lower earnings or earnings growth upon return, due to depreciation of firm or sector-specific human capital. Using longitudinal data from the NLS, this paper examines the effects of spells of(More)
This paper examines the determinants of success in self-employment, with a focus on the effects of the time spent caring for children. Many public policies are designed to encourage self-employment, especially among women. In addition, it has been argued that one of the reasons individuals, and women in particular, choose self-employment over wage and(More)
To what extent are there economic returns to learning a second or third language? Do the benefits differ according to country? This paper examines the return to multilingualism in the workplace. In particular, we estimate the effect that using an additional language in one's job has on earnings for a sample of workers in the European Community Household(More)
Schizophrenia is a heterogeneous disorder in which psychiatric symptoms are classified into two general subgroups-positive and negative symptoms. Current antipsychotic drugs are effective for treating positive symptoms, whereas negative symptoms are less responsive. Since the neuropeptide oxytocin (OT) has been shown to mediate social behavior in animals(More)
Bureau of Labor Statistics, for providing the gross change data and to Thomas Nardone for helpful comments and additional data. Working papers of the Federal Reserve Bank of Cleveland are preliminary materials circulated to stimulate discussion and critical comment. The views stated herein are those of the author and not necessarily those of the Federal(More)
One of the most significant challenges currently facing the system engineering profession is devising procedures for improving the system software requirements development process. While many practitioners promote a variety of automated tools and mechanistic templates as the means to improved productivity, experience suggests the highest leverage lies in(More)
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