From the Economist:
Having lived through the financial crisis of 2007-08, the man in the street might find the idea that markets are “efficient” incredible. But the efficient-market hypothesis, like a Hollywood monster, has proved very hard to kill off. From the truism that the average investor could not beat the market after costs, academics developed the insight that obvious market-beating opportunities would quickly be arbitraged away.
Here is a great example of efficient markets — not:
That chart could only have been effectively traded as a trend following trader. You used fundamentals to trade that? You are full of it or you were flipping coins and hit heads.