In this paper we extend the Harris-Todaro model of rural-to-urban migration to include urban agglomeration effects, some urban real wage flexibility, and a government budget constraint. Without employment subsidies laissez-faire migration is excessive unless real wage flexibility and agglomeration effects are high. Laissez-faire migration is too low compared with the first-best outcome supported by a subsidy, if its financing involves no costs. Simulations suggest that such a program would imply a substantial increase in taxation. If, as seems likely, an increase of this magnitude involves economic costs then the optimal outcome falls well short of first-best.
In this paper, we discuss the provision of bibliographic data as an extension of the open source concept. Our particular concern is the sustainability of such endeavors. We describe the RePEc (Research Papers in Economics) project, probably the largest "open source" bibliographic database. It demonstrates that opensource bibliographic data collection is sustainable.
Journal of Economic Literature Classification: L39
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