How Big is the Free Economy?

"Finally, there is what I call "real free". Products and services that don't cost most consumers anything at all, either in cash or ad clutter. (Most of this is online, where the marginal costs are near zero). This includes companies that use the "freemium" model (where a minority of paying customers support a majority of non-paying customers, as in Flickr and Flickr Pro or the growing world of online games), all those companies that are in the pre-revenue part of their evolution, and the entire "gift economy", from Wikipedia to the blogosphere."

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