„I believe that economic theory has arrived at a point in its development where the appeal to quantitative empirical data has become more necessary than ever. At the same time its analyses have reached a degree of complexity that require the application of a more refined scientific method than that employed by the classical economists.“

—  Ragnar Anton Kittil Frisch, Ragnar Frisch (1926); Quoted in: " Ragnar Frisch 1895-1995 https://www.ssb.no/a/histstat/doc/doc_199403.pdf." O. Bjerkholt, 1994.

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