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The impact of opportunity cost on personal and professional life
Evaluating the benefits and drawbacks of different choices
Understanding the concept of opportunity cost
Inefficiency is a necessary condition for superior investing. Attempting to outperform in a perfectly efficient market is like flipping a fair coin: the best you can hope for is fifty-fifty. For investors to get an edge, there have to be inefficiencies in the underlying process - imperfections, mispricings-to take advantage of.
The random walk hypothesis says a stock's price movements are of absolutely no help in predicting future movements. In other words, it's a random process, like tossing a coin. The hypothesis says, the fact that a stock's price has risen for the last ten days tells you nothing about what it will do tomorrow.
An excellent investor may be one who - rather than reporting higher returns than others - achieves the same return but does so with less risk or even achieves a slightly lower return with far less risk.
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