Back in 2009, the Justice Department said it was investigating the large Wall Street banks for possible collusion in the huge and opaque credit default swaps market. The question was whether the big financial institutions had worked to keep transactions in these insurance-like instruments closed to competitors and more profitable for themselves.  http://www.nytimes.com/2013/07/21/business/trying-to-pierce-a-wall-street-fog.html?nl=todaysheadlines&emc=edit_th_20130721&_r=0   Not much […]