Investor's consensus is that Visa (V +0.91%) and MasterCard (MA +0.70%) are great operators, but how do these two behemoths actually make their money? In this segment of The Motley Fool's financials-focused show, Where the Money Is, banking analysts Matt Koppenheffer and David Hanson break down the various revenue streams of Visa and MasterCard and dispel some myths about the two.