JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. The University of Chicago Press is collaborating with JSTOR to digitize, preserve and extend access to Journal of Political Economy.Possible explanations for earnings differentials in self-employment and paid employment are investigated. The empirical results suggest that the nonpecuniary benefits of self-employment are substantial: Most entrepreneurs enter and persist in business despite the fact that they have both lower initial earnings and lower earnings growth than in paid employment, implying a median earnings differential of 35 percent for individuals in business for 10 years. The differential cannot be explained by the selection of low-ability employees into self-employment and is similar for three alternative measures of self-employment earnings and across industries. Furthermore, the estimated earnings differentials may understate the differences in compensation across sectors since fringe benefits are not included in the measure of employee compensation.

The field of strategic management is predicated fundamentally on the idea that managements' decisions are endogenous to their expected performance implications. Yet, based on a review of more than a decade of empirical research in the Strategic Management Journal, we find that few papers econometrically correct for such endogeneity. In response, we now describe the endogeneity problem for cross-sectional and panel data, referring specifically to management's choice among discrete strategies with continuous performance outcomes. We then present readily implementable econometric methods to correct for endogeneity and, when feasible, provide STATA code to ease implementation. We also discuss extensions and nuances of these models that are sometimes difficult to decipher in more standard treatments. These extensions are not typically discussed in the strategy literature, but they are, in fact, highly pertinent to empirical strategic management research.

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ACS-NSQIP indicates that surgical outcomes improve across all participating hospitals in the private sector. Improvement is reflected for both poor- and well-performing facilities. NSQIP hospitals appear to be avoiding substantial numbers of complications- improving care, and reducing costs. Changes in risk over time merit further study.

Scientists and engineers in small firms are far more likely than their large firm counterparts to enter entrepreneurship. We label this phenomenon the small firm effect and explore its origins. In particular, we identify four classes of explanations for the small firm effect--preference sorting, ability sorting, opportunity cost, and the possibility that workers in small firms develop entrepreneurial human capital--and examine the empirical evidence for each. We find that preference sorting does play a role in generating the small firm effect: small firms attract those with prior preferences for autonomy who are similarly drawn into entrepreneurship. Similarly, ability sorting plays a role: those who ultimately become entrepreneurs may be drawn first to small firms because they offer tighter pay-for-performance links and can subsequently improve their expected earnings by becoming entrepreneurs, or because the skills required for success in small firms are also valuable in entrepreneurship. Evidence suggests that although those with the very least to lose do enter entrepreneurship with greater frequency, opportunity cost has at best a modest role to play in explaining the small firm effect. Finally, we interpret evidence that prior experience in small firms predicts positive performance outcomes in the early stages of entrepreneurship as suggesting that workers in small firms may develop entrepreneurial human capital that makes them better entrepreneurs. This effect may be largest among those of high ability.entrepreneurship, employee mobility, human capital, small firms, spawning