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"the spectrum describing the marketplace spans those with more time than money, who form the user and developer communities around free software; and those with more money than time, who purchase commercial support contracts"

blogs.sun.com/...congratulations_all - Preview

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"money is not the only scarcity in the world. Chief among the others are your time and respect ... we now have a handy way to convert from reputation (PageRank) to attention (traffic) to money (ads).... and Google plays the role of central banker"

www.wired.com/...ff_free - Preview

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You may need this key (provided by one of the commenters) to decipher this article:
RPM: Revenue per Mille
CPM: Cost per Mille
CPC: Cost per Click
CPA: Cost per Action

radar.oreilly.com/...the_economics_o_3.html - Preview

oreilly RPM CPM CPC CPA advertising revenue business_model 50million entrepreneurship adsense