It's all astroturfing anyway. Books are not fungible, no matter how you spin it. If I *want* to buy a New York Times Bestseller, but I don't want to pay the ridiculous price, buying a backlist copy of an Ed McBain police procedural is not the same thing.
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Fungibility is the property of a good or a commodity whose individual units are capable of mutual substitution, such as crude oil, shares in a company, bonds, precious metals or currencies. For example, if someone lends another person a $10 bill, it does not matter if they are given back the same $10 bill or a different one, since currency is fungible; if someone lends another person their car, however, they would not expect to be given back a different car, even of the same make and model, as cars are not fungible.
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