When the market is soaring, newcomers are told to ‘buy on dips’. When the market tumbles, the refrain changes. ‘Sell on rallies’, say the veterans. Time goes by. Newcomers become
old-timers. The advice is handed on, its longevity undoubtedly aided by the fact that it seems so reasonable. But wait. A dip is a dip only if the price doesn’t keep falling. What if you buy on a dip, and then, after...