Another day, another market plunge. Yesterday was notably sharp, with all major indices declining more than 2% and getting worse as the day wore on. The story du jour – and it is an axiom of market declines that there must be a story that goes with it – was that the sell-off was triggered be a toxic combination of weak U.S. economic data, more concerns about Greece and whether it would default on its debts and bring down the Eurozone