This paper applies Talpaz, Harpaz, and Penson's (THP) (Talpaz, H., A. Harpaz, J. B. Penson, Jr. 1983. Risk and spectral instability in portfolio analysis. Eur. J. Oper. Res. 14 262--269.) mean-variance-instability portfolio selection model to eight selected Taiwan stocks during 1980--89 to...

The Lo and MacKinlay variance-ratio test is used to examine random walks in Taiwan's 1971-1996 stock prices. The empirical results show that with weekly value-weighted market index, the null hypothesis of random walk is rejected, and the autocorrelation decreases after the 1990 speculation fad...

This paper corrects the errors of Peles and Stein's capital-setting (i.e., capital is ex-ante) model and Das' quantity-setting (i.e., all inputs are ex-ante) model. It also shows that rate-of-return regulated firms always overcapitalize in the quantity-setting case, but may overcapitalize,...