‘As oil crashes, is it time to short solar stocks?’ Gosh, I wish I’d read that headline a year ago. The solar stock it tipped for doom in January 2015 has since plummeted from $19 to $2.65.

Yes, hindsight can be a wonderful thing. But what if there were an area of the markets which you knew to be grotesquely overvalued as a result of ignorance, dishonesty, and false sentiment? You’d be mad not to bet against it, wouldn’t you? It would hardly be gambling: more like plain common sense.