By now you may have heard that JPMorgan Chase lost $2 billion on a bad trade. Multiply that by 10, and you're starting to get a better idea of how much it has really lost.

That's because the share price of the biggest U.S. bank by assets has tumbled by more than 11 percent since it announced the trading loss, shaving about $17.5 billion from its market value. JPMorgan shares were down another 2 percent on Monday, following a 9 percent tumble on Friday.