“…Arbitrariness review, in its entirety, is in fact rooted in cost–benefit logic: its prohibition of arbitrary and capricious behavior can be interpreted as a demand for administrators to provide evidence––taking account of all relevant variables––that their decisions are on balance more beneficial than costly, more productive than ruinous (Kuran and Sunstein, 1999: 758). Cost–benefit analysis has been recognized to be a useful debiasing technique in making risk judgments (Brest, 2013: 486) and counteracting availability heuristics and informational cascades, which divert decision makers’ attention from the questions that should be answered (Kuran and Sunstein, 1999), such as the actual consequences of competing approaches, and which are often ignored due to the influence of emotions (Vandenbergh et al, 2011). Cost–benefit thinking, which pervades hard look’s prescription for rational behavior, should help prevent agency decisions being driven by public hysteria or unfounded alarmism; indeed, ‘hysteria’ that endures a searching ex ante hard look investigation by officials themselves is likely one that is rational and appropriate (Sunstein, 2000).…”