Perhaps he's never heard of pharmacists?

Check out the Forbes.com article "A Free Lunch" by Paul H. Rubin, Professor of Law and Economics at Emory University and former Chief Advertising Economist at the Federal Trade Commission and Chief Economist at the U.S. Consumer Product Safety Commission; an excerpt:

Drug company reps offer overworked doctors useful, lifesaving information in an efficient manner. The drug companies are of course motivated by profit, but economists have known since Adam Smith that the profit motive is the best way to induce someone to do something useful.

Click here to access the article.