Abstract
Many studies find that stock returns are related to firm size and the book-to-market ratio. This article provides a theoretical explanation for this phenomenon. We show that profit maximizing homogenous firms should converge to a stable long-run equilibrium in which firm's capital size and growth rates are shaped by the economic environment, and both influence stock returns. Our evidence shows firm convergence towards the optimum profitability size in a changing equilibrium. Firm characteristics reflect sensitivity to the macroeconomic environment. Our model and empirical tests demonstrate a linkage between this sensitivity and the relationship of returns to market value and book-to-market.
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