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Question 813 market efficiency

The famous investor Warren Buffett is one of few portfolio managers who appears to have consistently beaten the market. His company Berkshire Hathaway (BRK) appears to have outperformed the US S&P500 market index, shown in the graph below.

Read the below statements about Warren Buffett and the implications for the Efficient Markets Hypothesis (EMH) theory of Eugene Fama. Assume that the first sentence is true. Analyse the second sentence and select the answer option which is NOT correct. In other words, find the false statement in the second sentence.

(a) Buffett is clever and by reading the news and financial reports he is able to buy under-priced stocks and sell over-priced stocks. This provides evidence for rejecting the semi-strong and strong form EMH.

(b) Buffett was lucky, his strategy happened to be the right one, not due to its merits, just by chance. This provides no evidence for or against the weak, semi-strong or strong form EMH.

(c) Buffett’s investment strategy exposes investors to higher undiversifiable risk than the market and therefore deserves a higher return. This provides no evidence for or against the weak, semi-strong or strong form EMH.

(d) Buffett is an insider trader and is able to make money from his private information. This provides evidence for rejecting the semi-strong and strong form EMH. (Note: Warren Buffett is not an insider trader, he is an honest philanthropist, but assume the contrary in this answer option).

(e) Buffett may not have beaten the market because the graphs ignore dividends - the S&P500 is the price index rather than the accumulation index and BRK pays no dividends, so even though BRK has a higher capital return than the S&P500, the total returns could be equal. This provides no evidence for or against the weak, semi-strong or strong form EMH.

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