The de minimis principle prescribes that decision makers ought to ignore sufficiently improbable risks in the decision-making process. In this paper we discuss three popular explications of this principle, and argue that none of these is satisfactory. It is concluded that the concept of negligible risk is vague, ie that there is no sharp line to be drawn between negligible and non-negligible risks.
KeywordsDe minimis de manifestis negligible risk undetectable risk natural risk vagueness
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