Efficiency is not so universal that we should give up on superior performance.
Efficiency is what lawyers call a ‘rebuttable presumption’ – something that should be presumed to be true until someone proves otherwise.
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.
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Successful investing requires thoughtful attention to many separate aspects, all at the same time. The Most Important Thing by Howard Marks covers these key aspects in layman language and without a lot of finance jargon though it covers the concepts of investment theory.
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