At the broadest and vaguest level, cost-benefit analysis may be regarded simply as systematic thinking about decision-making. Who can oppose, economists sometimes ask, efforts to think in a systematic way about the consequences of different courses of action? The alternative, it would appear, is unexamined decision-making. But defining cost-benefit analysis so simply leaves it with few implications for actual regulatory decision-making. Presumably, therefore, those who urge regulators to make greater use of the technique have a more extensive prescription in mind.