3 Quotes by John Maurice Clark

The economist may attempt to ignore psychology, but it is sheer impossibility for him to ignore human nature … If the economist borrows his conception of man from the psychologist his constructive work may have some chance of remaining purely economic in character. But if he does not, he will not thereby avoid psychology. Rather, he will force himself to make his own, and it will be bad psychology.

Knowledge is the only instrument of production that is not subject to diminishing returns.

It takes resolution to go forth from the ease and beautiful simplicity of a well-formed hypothesis and struggle with amorphous facts.