Clarifying Frank Knight's discussion of the meaning of risk and uncertainty
指出弗兰克·奈特（1921）对风险与不确定性的著名区分存在基本混淆，并定位问题来源，提出避免混淆的重新表述。
Frank Knight's (1921) famous distinction between risk and uncertainty has entered the jargon of economics and decision theory. Yet it appears to have gone unnoticed that his formulation suffers from an elementary confusion. This note locates the source of the problem and proposes a reformulation that avoids it. Copyright 1998 by Oxford University Press.