Uninsured Idiosyncratic Investment Risk: Positive and Normative Implications
AbstractThe neoclassical growth model is augmented to study the macroeconomic effects of uninsured idiosyncratic investment risk. As compared to complete markets, the steady state is characterized by both a lower interest rate and a lower capital stock when the elasticity of intertemporal substitution is sufficiently high relative to the contribution of private equity in total wealth. Turning to normative implications, the constrained efficient level of investment in a two-period version of the model is higher than the equilibrium one---and hence a subsidy on investment is optimal---even in situations where the equilibrium features higher capital that the first best. While the positive results contrast with Bewley-type models, where labor-income risk necessarily leads to higher aggregate saving, the normative results highlight how idiosyncratic investment (or entrepreneurial) risk can have novel implications also for optimal taxation
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Bibliographic InfoPaper provided by Society for Economic Dynamics in its series 2006 Meeting Papers with number 596.
Date of creation: 03 Dec 2006
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Postal: Society for Economic Dynamics Christian Zimmermann Economic Research Federal Reserve Bank of St. Louis PO Box 442 St. Louis MO 63166-0442 USA
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idiosyncratic risk; incomplete markets; efficiency; pecuniary externality;
Find related papers by JEL classification:
- D52 - Microeconomics - - General Equilibrium and Disequilibrium - - - Incomplete Markets
- E13 - Macroeconomics and Monetary Economics - - General Aggregative Models - - - Neoclassical
- E32 - Macroeconomics and Monetary Economics - - Prices, Business Fluctuations, and Cycles - - - Business Fluctuations; Cycles
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