MAP20080023683 Lai, Gene C. The Wealth effect of demutualization : evidence from the U.S. property-liability and life insurance industries / Gene C. Lai, Michael J. McNamara, Tong Yu En: The Journal of risk and insurance. - Nueva York : The American Risk and Insurance Association, 1964- = ISSN 0022-4367. - 01/03/2008 Tomo 75 Número 1 - 2008 I. McNamara, Michael J. . II. Yu, Tong .