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Do Stockholders Share Risk More Effectively Than Non- stockholders?

  • Fatih Guvenen

    (University of Rochester)

This paper analyzes the extent of risk-sharing among stockholders and among nonstockholders. Wealthy households play a crucial role in many economic problems due to the substantial concentration of asset holdings in the U.S. data. Hence, to evaluate the empirical importance of market incompleteness, it is essential to determine if idiosyncratic shocks are important for the wealthy, who have access to better insurance opportunities, but also face different risks, than the average household. We study a model where each period households decide whether to participate in the stock market by paying a fixed cost. Due to this endogenous entry decision, the testable implications of perfect risk- sharing take the form of a sample selection model, which we estimate and test using a semi-parametric GMM estimator proposed by Kyriazidou (2001). Using data from PSID we strongly reject perfect risk-sharing among stockholders, but perhaps surprisingly, do not find evidence against it among non-stockholders. These results appear to be robust to several extensions we considered. These findings indicate that market incompleteness may be more important for the wealthy, and suggest further focus on risk factors that primarily affect this group, such as entrepreneurial income risk.

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File URL: http://econwpa.repec.org/eps/mac/papers/0508/0508006.pdf
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Paper provided by EconWPA in its series Macroeconomics with number 0508006.

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Length: 28 pages
Date of creation: 06 Aug 2005
Date of revision:
Handle: RePEc:wpa:wuwpma:0508006
Note: Type of Document - pdf; pages: 28
Contact details of provider: Web page: http://econwpa.repec.org

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