"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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