JPMorgan's trading slump is even worse than Dimon warned

Wall Street slumped on Thursday after two of the largest banks, JPMorgan Chase and Citigroup, reported that trading had fallen during the third quarter. JPMorgan, the largest US bank, saw a huge 27-percent drop in bond trading revenue, to $3.1 billion, compared to the same period last year. That's even worse than a slump of...