Capital Asset Pricing Model Essay

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In the following essay I will be comparing and contrasting the effectives of capital asset pricing model (CAPM), Arbitrage Pricing Theory, and the Fama-French three factor model when estimating the cost of capital and explaining performance of investment portfolios.

Todays widely used CAPM model was originally developed by Sharpe (1964) in order to explain how capital markets set share prices. (Pike and Neale) However, was then developed by others such as Harry Markowitz, John Linter and Jack Treynor. In result of research by Sharpe (1964), Litner (1965) and Black (1972) the Capital Asset Pricing Model (CAPM) is that “the relationship between beta and expected returns is linear, exact, and has a slope equal to the expectation of the market …show more content…

So this raises the question what is the CAPM model useful for and how effective is it when estimating cost of capital? Scholars such as Perold (2004) have answered this question through testing and analysis, they have found that even if the model does not give us an accurate real world result in estimating todays cost of capital, it can aid us in predicting future investor behaviour. I would agree with this conclusion of CAPM and Perold’s view on its effectiveness when estimating cost of capital and explaining performance of investment portfolios when given incorrect variables. However, on this note I do not argue that CAPM is theoretically incorrect but from a investors point of view it is questionable, scholars such as Levy (2010) have also stated this within their research of CAPM backing up their argument with thorough testing and analysis within his journal ‘The CAPM is alive and …show more content…

They found that APT was not sensitive to the number of risk factors above five, and that the CAPM approach of measuring portfolio investment were more related to average returns without any risk adjustments like APT.

We cannot deny that APT is effectively applicable when explaining performance of investment portfolios, this has been researched and tested by a number of scholars. Most recently Ramadan (2012) carried out a test of validity of APT in the Jordian Stock Market, his findings were that macroeconomic variables as well as market indicators explained 84% of the variation in returns on his chosen market portfolio. Another finding was that the effect of certain variables converse when comparing industries within the market. (Ramadan,

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