I just stumbled on these articles written in the last two days claiming that corporate debt is more than double what was reported, due to money hidden in currency exchanges (from what I understand).
http://business.financialpost.com/news/economy/credit-bubble
Global reported GDP: $75 trillion
Global reported debt (revised): $10.7 trillion => $25 trillion
When does this hit crisis if debt is already 1/3 of the global GDP?