But free is not quite as simple — or as stupid — as it sounds. Just because products are free doesn’t mean that someone, somewhere, isn’t making huge gobs of money. Google is the prime example of this. The monetary benefits of craigslist are enormous as well, but they’re distributed among its tens of thousands of users rather than funneled straight to Craig Newmark Inc. To follow the money, you have to shift from a basic view of a market as a matching of two parties — buyers and sellers — to a broader sense of an ecosystem with many parties, only some of which exchange cash.