Your customers used to get what they paid for, more or less. Now they’re poaching value left and right. Just a few years ago, when typical retail shoppers went to a store and received advice on the size, style, or purpose of a product, they almost always bought the product right then and there. If they were looking for personalized service, they chose stores that offered it—and paid premium prices for it. If they were bargain hunters, they sought out no-frills shops. Whichever distribution channel they opted for, they stayed with it until the sale was made.

A version of this article appeared in the November 2003 issue of Harvard Business Review.