Sure. The thing is that the products are bought well in advance by booksellers. Books don't go out of date like milk. They're sitting on a shelf. They're a product. They've been paid for. Some of them have up to six months, a year. They could be in a store because they still continue to sell. Books are not reprinted continually.
So if a bookseller has paid at an exchange rate of maybe 20% and now all of a sudden a consumer is demanding that they want to buy the book in U.S. dollars at the U.S. price--and you can see by the figures I gave you that there's a very small margin in bookstores to begin with--it puts them at a terrible disadvantage.