The Federal Trade Commission recently launched what’s likely to be a broad antitrust investigation of Google. David Shonka, the FTC’s principal deputy general counsel, says there is a misperception that government agencies have unlimited resources to shoulder the burden of electronic data discovery costs in big cases like this.

“You have to keep in mind that by the time you take $100 billion in tax revenue and divide it [among] the various shops and departments, the allocation available can be very small,” says Shonka, who also heads the agency’s E-Discovery Steering Committee. “It is not unusual for the FTC to litigate a company over a product that has a larger advertising budget than our entire appropriation.”