The system is coupled with hedge funds and etc. because the money they use come from banks. Goldman Sachs and others don't have the money to maintain all their

The system is coupled with hedge funds and etc. because the money they use come from banks. Goldman Sachs and others don't have the money to maintain all their obligations, it all comes from other banks that loan the required funds. When there are problems in money part of the banking system, everything goes down.