This paper examines four issues associated with the Officer model, in the context of estimating the cost of equity capital for regulatory purposes. The conclusions are thus. First, regarding the issue of foreign investors, continued use of a version of the Capital Asset Pricing Model that...

In estimating a firm's cost of equity with the CAPM the standard procedure is to proxy the market portfolio by a share index. Since this index is not the market portfolio this may give rise to a bias in estimating the firm's cost of equity. This paper investigates this bias and concludes that it...

This paper examines the relationship between the market weight of a single stock and the betas of both that stock and the residual portfolio. Theory suggests that the effect of such a large weight is to significantly reduce the beta of the residual portfolio, and it may also significantly raise...