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Titles of all papers issued since April 2004 are presented below. For previous papers, see past issues of the NBER Reporter. Working Papers are intended to make results of NBER research available to other economists in preliminary form to encourage discussion and suggestions for revision before final publication. They are nor reviewed by the Board of Directors of the NBER.

NBER Working Papers Paper Author(s) Title 10431 Michael D. Bordo The Yield Curve, Recessions and Joseph G. Haubrich the Credibility of the Monetary Regime: Long Run Evidence 1875- 1997 10432 Luis Garicano Hierarchies, Specialization, and Thomas N. Hubbard the Utilization of Knowledge: Theory and Evidence from the Legal Services Industry 10433 William D. Nordhaus Schumpeterian Profits in the American Economy: Theory and Management 10434 Paul Asquith Short Interest and Stock Returns Parag A. Pathak Jay R. Ritter 10435 Janet Currie Child Mental Health and Human Mark Stabile Capital Accumulation: The Case of ADHD 10436 Zoran Ivkovich Information Diffusion Effects in Scott Weisbenner Individual Investors' Common Stock Purchases: Covet Thy Neighbors Investment Choices 10437 Avi Dor Managed Care Discounting: Siran Koroukian Evidence from the Market Scan Michael Grossman Database 10438 Robert J. Barro Which Countries Have State Rachel M. McCleary Religions? 10439 James E. Anderson Political Pressure Deflection Maurizio Zanardi 10440 Katherine Baicker Fiscal Shenanigans, Targeted Douglas Staiger Federal Health Care Funds, and Patient Mortality 10441 Linda Goldberg Financial-Sector FDI and Host Countries: New and Old Lessons 10442 Maria Borga Factor Prices and Factor Robert E. Lipsey Substitution in U.S. Firms: Manufacturing Affiliates Abroad 10443 Olivier Blanchard The Optimal Design of Jean Tirole Unemployment Insurance and Employment Protection: A First Pass 10444 Takashi Oshio Social Security and Trust Fund Management 10445 Anna Aizer Access to Care, Provider Choice, Adriana Lleras-Muney and Racial Disparities Mark Stabile 10446 Simon Gilchrist Investment, Capacity, and John C. Williams Uncertainty: A Putty-Clay Approach 10447 Gopal K. Basak Assessing the Risk in Sample Ravi Jagannathan Minimum Risk Portfolios Tongshu Ma 10448 Yuko Hashimoto High-Frequency Contagion Between Takatoshi Ito the Exchange Rates and Stock Prices 10449 Malcolm Baker Investor Sentiment and the Jeffrey Wurgler Cross-Section of Stock Returns 10450 Patrick Bajari Estimating Dynamic Models of C. Lanier Benkard Imperfect Competition Jonathan Levin 10451 John Joseph Wallis Constitutions...