The advantages and disadvantages of the CAPM


The advantages of the CAPM

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The great strength of the Capital Asset Pricing Model (CAPM) is that it gives you a coherent picture of expected return and risk relatively easily and quickly. Together with other factors, the assumptions of this model can serve as the basis for building a portfolio.

In addition, the CAPM is the ideal tool to check the efficiency of the already existing portfolio. It may be possible to achieve the same return in a different composition, but with less risk.

What are the weaknesses and disadvantages of the Capital Asset Pricing Model (CAPM)?

The assumptions from the 1960s have, of course, been continually expanded by economists and do not apply psychologically to all market participants. Behavioural finance has shown that investors do not always behave rationally, profit-maximising and risk-averse.

Instead, they may, for example, be strongly influenced by the news situation or take too high risks if they are unaware of it. A large proportion of investors act de facto irrationally - with increasing access to the market for small investors, this factor actually grows and the predictability of risk decreases.

The strong focus on volatility also allows only limited conclusions about the actual risk. After all, the past is always taken into account. In addition, there are many other factors that could affect growth. In segments such as the hydrogen industry, for example, a bubble can form, which can hardly be identified as a risk with the help of the beta factor during strong growth.

Furthermore, the CAPM assumes a stable risk-free interest rate over a longer period of time. In reality, however, the value changes continuously. If this is not taken into account, certain shares can be wrongly identified as overvalued or undervalued.

Furthermore, the comparative value, i.e. the market portfolio, is a problem. Since one refers to a certain index for the sake of simplicity, it is not the actual total market. And even then, buying all the papers on the market is not really an alternative in practice.

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Arbitrage pricing theory as a contemporary alternative

In view of the weaknesses especially in the basic assumptions in the CAPM, the Arbitrage Pricing Theory (APT) was developed by Stephen Ross. It too attempts to compare the cost of equity, expected return and risk. In contrast to the Capital Asset Pricing Model, the theory no longer assumes that a market equilibrium is achieved, but rather that there is no arbitrage. By definition, arbitrage is the risk-free exploitation of price differences to generate profits.

Conclusion on the Capital Asset Pricing Model (CAPM)

Portfolio theory and the CAPM were the first postulates in the 1950s and 1960s to establish that diversification of a portfolio has a positive effect on the risk-return ratio. By spreading the risk of loss more widely, possible losses can be offset. It is precisely in this realisation that the great progress created by the developers of the model lies.

In reality, it must be assumed today that the CAPM works with many assumptions that are out of touch with reality. Nevertheless, its simple application makes it one of the most frequently used models on the financial market. However, it is not used uncritically and especially not without a look at other ratios.

Nevertheless, especially the beta factor and the efficiency analysis of a portfolio can give good indications as to whether one is on the right track with one's investment. In combination with other analysis tools, a more comprehensive picture of the stock market can be created and thus an efficient portfolio can be built in a more targeted manner.

Online brokers such as exness-sg.com/metatrader4/ provide you with these tools free of charge and thus help you to quickly arrive at the necessary figures. Especially the specification of the beta factor is an advantage and relieves you of a lot of calculation work. I recommend that you act thoughtfully even when identifying securities with high expected returns and proceed rationally just as in Markowitz's assumption. Weighing up the opportunities for returns and risk as well as a broad diversification of capital are the golden basic rules for trading with shares.