WASHINGTON — One of the more surprising conclusions drawn by the Federal Trade Commission when it dropped its nearly two-year antitrust investigation into Google last week was that Google, far from harming consumers, had actually helped them.

But some critics of the inquiry now contend that the commission found no harm in Google’s actions because it was looking at the wrong thing.

Instead of considering harm to people who come to Google to search for information, Google’s competitors and their supporters say that the government should have been looking at whether Google’s actions harmed its real customers — the companies that pay billions of dollars each year to advertise on Google’s site.

In its reports, the F.T.C. did not detail how it defined harm or what quantitative measures it had used to determine that Google users were better off.