While the payment networks of giants Visa (V -2.32%) and MasterCard (MA -2.39%) are enormous and currently cannot be matched, smaller players Discover (DFS) and American Express (AXP -1.78%) aren't sitting idly by -- they're taking action.

In this video, Motley Fool financial analysts Matt Koppenheffer and David Hanson discuss how Discover is leveraging its smaller network by reaching out to a huge number of partners, and the initiatives American Express is making to reach out to a large number of smaller businesses, where Visa and MasterCard are currently undercutting American Express on price.