Here's Why Capital One, Amex, and Discover Were Falling on Friday

The stock market was having a negative day on Friday, with the Dow Jones Industrial Average down 1.7% at the close and the S&P 500 off 1.5%.

One part of the market that was getting hit especially hard was the credit card industry. Capital One (NYSE: COF) and American Express (NYSE: AXP) were both down nearly 4%, while Discover Financial Services (NYSE: DFS) was down almost 8%. And all had been rather volatile throughout the trading day.

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Source Fool.com