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The library has set the price of "free" (or rather a small cut of your tax dollars) to be able to read the book with less convenience. Sometimes it's a little less convenient. You have to go to the library during their hours, find the book, check it out, bring it back, etc. Sometimes there's a lot less convenience. It may be checked out. There may be a list. If it's popular you may have to wait for months. The fair market price for the book you want on demand is a different matter.
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