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What is meant when we say that stock prices follow a random walk? What is the efficient market hypothesis (EMH) as it relates to stock

What is meant when we say that stock prices follow a random walk?

What is the efficient market hypothesis (EMH) as it relates to stock prices?Distinguish between the three versions of the EMH.

Successful firms such as Microsoft and Apple have consistently delivered strong stock returns. Is this a violation of EMH? Why or why not?

A portfolio manager of a well known mutual fund out-performed the S&P 500 for each of the last 4 years. Does this violate the EMH?

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