The further away a scholarly opinion is from direct observation and the more abstract and 'theoretical' it is, the more defenseless it becomes against insidious opportunist errors of judgment. In economics, model thinking in particular creates scope for systematic biases... But of course all social studies must nevertheless aim at generalization. It is thus important to be able to think concretely at the same time, as I learnt from Gustav Cassel.

Gunnar Myrdal (1982, 265); 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. 534-5