The hardest thing about B2B selling today is that customers don’t need you the way they used to. In recent decades sales reps have become adept at discovering customers’ needs and selling them “solutions”—generally, complex combinations of products and services. This worked because customers didn’t know how to solve their own problems, even though they often had a good understanding of what their problems were. But now, owing to increasingly sophisticated procurement teams and purchasing consultants armed with troves of data, companies can readily define solutions for themselves.

A version of this article appeared in the July–August 2012 issue of Harvard Business Review.