In this segment of The Motley Fool's all-financials show Where the Money Is, Fool financial analysts Matt Koppenheffer and David Hanson take a question from a Fool reader on Facebook who writes, "What is the fair market value of MasterCard (NYSE:MA)?"

Matt and David discuss why precise valuation models depend on predicted future data that makes them almost inherently wrong and why a general picture of MasterCard's revenue growth and prospects as a company can be much more useful in deciding whether this is "a good company at a fair price," as Warren Buffett would say, or a stock that's gotten a bit too far ahead of itself.