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Cass R. Sunstein, The Limits of Quantification, 102 Calif. L. Rev. 1369 (2014).

Abstract: The problem of nonquantifiability is a recurrent one in both public policy and ordinary life. Much of the time, we cannot quantify the benefits of potential courses of action, or the costs, or both, and we must nonetheless decided whether and how to proceed. Under existing Executive Orders, agencies are generally required to quantify both benefits and costs, and (to the extent permitted by law) to show that the former justify the latter. But agencies are also permitted to consider apparently nonquantifiable factors, such as human dignity and fairness, and also to consider factors that are not quantifiable because of the limits of existing knowledge. When quantification is impossible, agencies should engage in “breakeven analysis,” by which they explore how high the nonquantifiable benefits would have to be in order for the benefits to justify the costs. Breakeven analysis can be used and potentially disciplined in three different ways. (1) Sometimes agencies are able to identity lower or upper bounds, either through point estimates or through an assessment of expected value. (2) Agencies can often make progress by exploring comparison cases in which relevant values have already been assigned (such as for a statistical life). (3) When agencies cannot identify lower or upper bounds, and when helpful comparisons are unavailable, breakeven analysis requires agencies to identify what information is missing and to specify the conditions under which benefits would justify costs (“conditional justification”). In admittedly rare cases, regulators, no less than individuals, might have to “pick” or instead to “opt.”