Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
Owners of private companies often invest a substantial share of their net worth in one company, which exposes them to idiosyncratic risk. We investigate whether owners of US companies require compensation for lack of diversification in the form of higher returns on equity. Exposure to idiosyncratic risk is measured as the share of the owner's net worth invested in the company. Equity returns are measured as the earnings rate and as capital gains. For both returns measures we find a positive and significant influence of exposure to idiosyncratic risk. This paper improves our understanding of returns on private equity. Copyright 2010, Oxford University Press.