The market is inefficient.
What I mean by this is that the market is always in a state of controlled chaos. Some may consider this equilibria, but it is equilibria in a very limited sense of the word. Equilibria is not the same as intrinsic or fundamental value (which is also in the eye of the beholder).
Because market prices are a function of consensus feelings, emotions, expectations and sentiment regarding earnings, interest rates, risk and the future (in other words they reflect the current zeitgeist of the day and embed some feelings for the future), they are necessarily wrong all the time. No one knows what the future holds. Of course as markets correct and swing from overvalued to undervalued and vice versa, they must by definition pass through some median or fair value point. The problem is they rarely trade at the fair value point for any steady state period of time.
Getting cyclical trend and momentum right are consequently the most important ingredients to long term active investing, while have a mean reversion contrarian disposition can help cut off the excesses of the tails. The problem is we never really know beforehand the timing, time or magnitude of any new cycle.
Therein lies the problem.
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