A large part of the empirical work on differentiated products markets has focused ondemand estimation and the pricing behavior of firms. These two themes are key inputsin important applications such as the merging of two firms or the introduction of newproducts. The validity of inferences,...

This paper examines the components of the Capital Asset Pricing Model and the modelâs uses to analyze portfolios returns. It also looks at subsequent versions of the CAPM including a multi-variable CAPM with the inclusion of selected macro-variables as well as a non-stationary beta CAPM to...