Economist warns of perfect storm that will destroy economy!

A perfect market storm is brewing and it's going to leave economic carnage in its wake, a finance expert has warned. Investors should prepare for world stock markets to sink by a massive 12% amid a repeat of the turmoil that tore through stock markets at the beginning of the year, according to David Rosenberg who is chief economist and strategist at wealth management firm Gluskin Sheff.