Economics is in high degree a pedagogical discipline, and an economist must be in close touch with popular psychology in order to know what ought to be said at any particular moment.
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Quoted in Bertil Ohlin (1972, 107); as cited in: Carlson, Benny, and Lars Jonung. "Knut Wicksell, Gustav Cassel, Eli Heckscher, Bertil Ohlin and Gunnar Myrdal on the role of the economist in public debate." Econ Journal Watch 3.3 (2006): p. 525