Multiple q and Investment in JapanIn this book, a framework of the investment function is developed that allows for the heterogeneity of capital goods, i. e., the Multiple q model, and investment behavior in Japan by employing this Multiple q framework is developed. The standard approach to investment behavior is Tobin's q theory in which the investment rate is a linear function of only the q ratio, or a firm's market value measured by its capital goods. As is well known, however, its