The answer is: no one knows. Many self-styled “gurus” and “pundits” – authors of voluminous tomes they sell to the gullible – pretend to know. But their “expertise” is an admixture of guesswork, superstitions, anecdotal “evidence” and hearsay. The sad truth is that no methodical, long term, and systematic research has been attempted in the nascent field of e-publishing and, more broadly, digital content on the Web. So, no one knows to say for sure whether free content sells, when, or how.
There are two schools – apparently equally informed by the dearth of hard data. One is the “viral school”. Its vocal proponents claim that the dissemination of free content fuels sales by creating “buzz” (word of mouth marketing driven by influential communicators). The “intellectual property” school roughly says that free content cannibalizes paid content mainly because it conditions potential consumers to expect free information. Free content also often serves as a substitute (imperfect but sufficient) to paid content.
Experience – though patchy – confusingly seems...