"Economics is a science of thinking in terms of models joined to the art of choosing models which are relevant to the contemporary world. It is compelled to be this, because, unlike the typical natural science, the material to which it is applied is, in too many respects, not homogeneous through time. The object of a model is to segregate the semi-permanent or relatively constant factors from those which are transitory or fluctuating so as to develop a logical way of thinking about the latter, and of understanding the time sequences to which they give rise in particular cases. Good economists are scarce because the gift for using "vigilant observation" to choose good models, although it does not require a highly specialised intellectual technique, appears to be a very rare one."
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Original Language: English
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Sources
John Maynard Keynes, Letter to Roy Harrod (4 July 1938), in The Collected Writings of John Maynard Keynes, Vol. XIV (1971), p. 297
https://en.wikiquote.org/wiki/Economics
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Economics
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