US politicians, including President Barack Obama, have been calling on Europe to fix its debt crisis, amid fears it will have a negative impact on the fragile US economy.<br /><br />But there is evidence that the Greek debt crisis began on Wall Street, at the hands of one controversial US bank.<br /><br />According to former financial regulators, Goldman Sachs made a dozen derivative deals with the Greeks a decade ago, writing its debt off its balance sheet for a number of years.<br /><br />They also say that Goldman and Greece were not the only ones working such transactions.<br /><br />Al Jazeera's Patty Culhane investigates the morality versus legality of who is to blame for the financial crisis that is scaring the world.
