Try this experiment. Cut and paste "0121822028" into the Amazon search box at the end of this paragraph. This is the product number for a popular college biology book. You'll see that the retail price for the book is $150-$200. Click on the book, and the Amazon website will launch in a separate window. Check out the Amazon Marketplace prices! They're far lower than the retail price. Next, run an eBay search with the same product number and look at how much profit you can make!
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