When Kirtsaeng moved to the US in 1997 to pursue an undergraduate degree in mathematics at
    Cornell University,[4] he discovered that textbooks (not just those published by Wiley, but
    of other publishers too) were considerably more expensive to buy in the United States than
    in his home country. Kirtsaeng asked his relatives from Thailand to buy such books at home
    and ship them to him to sell at a profit. He sold the imported books on eBay, making $1.2
    million in revenue, although the parties disputed the net profit amount.

A text book case (ha!) about one of the mechanisms that enable the free markets and trade to bring the prices of goods down.