"Unlike the position that exists in the physical sciences, in economics and other disciplines that deal with essentially complex phenomena, the aspects of the events to be accounted for about which we can get quantitative data are necessarily limited and may not include the important ones."

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In war there are none but particular cases; everything has there an individual nature; nothing ever repeats itself. In the first place, the data of a military problem are but seldom certain; they are never final . Everything is in a constant state of change and reshaping.

— Ferdinand Foch