Published online by Cambridge University Press: 19 October 2009
The simultaneity of security price determination has been recognized for many years. Lintner [6], Lerner and Carleton [5], Mossin [9], Sharpe [10], Tobin [15], and others have all advocated that securities be treated in a portfolio sense implying security prices are determined simultaneously. The empirical work in finance is just beginning to deal formally with this simultaneity.