The Appropriateness of the Capm as an Asset Pricing Model

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The appropriateness of the CAPM, as an asset pricing model Introduction The problem of estimating the cost of capital asset, or the return expected by shareholders, is one of the most debated issues in the context of the Financial Theory. The different estimation models, produced in order to develop a theory of the cost of capital have found extensive discussion in the literature, feeding the debate on both hand theoretical and the empirical. An important contribution to the evolution of these models is due to Harry Markowitz (1952), Father of Modern Portfolio Theory, which has provided an initial interpretation of the relationship between risk and return. Based on the studies of Markowitz, Sharpe (1964), Lintner (1965) and Mossin (1966), draw the Capital Asset Pricing Model, a model that predicts the expected return of the security, performance or market equilibrium, depending on the risk investment. The CAPM assumes a perfectly competitive market with informational efficiency, the absence of transaction costs, and the presence of risk-free rate. The three variables on which the model is based are: risk-free rate, the coefficient of systematic risk, beta, and the expected premium for the risk. Since some of the underlying assumptions of the model appear to be far from reality, such as the ability to borrow and lend without limit to the risk-free rate, the absence of taxes, and others, the CAPM has been criticized over the last forty years, part of the financial economy. The first verification tests of the Capital Asset Pricing Model were carried out by Sharpe (1966) and Jensen (1967) on Mutual Funds with good results. However, Black (1972 ) created a variant of the model known as " zero- beta model" which involves the replacement risk-free asset with another asset or portfolio , not correlated with the market , so as to make the model more close to

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