MAP20078043297 Efficiency and demutualization: Evidence from the U.S. Life Insurance Industry in the 1980s and 1990s / Vivian Jeng, Gene C. Lai and Michael J. McNamara En: The Journal of risk and insurance. - Nueva York : The American Risk and Insurance Association, 1964- = ISSN 0022-4367. - Número 3 74 2007