Khác biệt giữa bản sửa đổi của “Sự không chắc chắn”

{{Quote|Uncertainty must be taken in a sense radically distinct from the familiar notion of risk, from which it has never been properly separated.... The essential fact is that 'risk' means in some cases a quantity susceptible of measurement, while at other times it is something distinctly not of this character; and there are far-reaching and crucial differences in the bearings of the phenomena depending on which of the two is really present and operating.... It will appear that a measurable uncertainty, or 'risk' proper, as we shall use the term, is so far different from an unmeasurable one that it is not in effect an uncertainty at all.|sign=[[Frank Knight]] (1885–1972)|source=''Risk, Uncertainty, and Profit'' (1921), [[University of Chicago]].<ref>{{citechú bookthích sách |last=Knight |first=F. H. |year=1921 |title=Risk, Uncertainty, and Profit |location=Boston |publisher=Hart, Schaffner & Marx }}</ref>}}{{Pull quote|You cannot be certain about uncertainty.|author=Frank Knight}}