The Federal Communications Commission rule making for low power FM radio was widely reported as an instance where Congress sharply rebuked a regulatory agency for enacting rules too favorable to entrants. Theories of bureaucratic control generally agree that when such events occur, policy differences of Congress and the agency must be large. Because rival policy positions are quantifiable in this case, the preferences of Congress and the Commission can be directly evaluated. While the distance between the policy position of the Commission and Congress appear large, they signified a negligible increment in competition when compared to a benchmark efficient policy. A financial event study supports this interpretation, as radio broadcaster’s equity values were not materially affected by either events in Congress or the Commission. Thus, even marginal differences may prompt a costly intervention by Congress to ostensibly discipline an agency.