This paper is an updated version of a previous working paper, Capital Budgeting in the Presence of Managerial Overconfidence and Optimism, by the same authors. Financial support by the Rodney L. white Center for Financial Research is gratefully acknowledged. The authors would like to thank Andrew Abel, Jonathan Berk, Domenico Cuoco, David Denis, Janice Eberly, Robert Goldstein, Peter Swan, and seminar