“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.”

“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.”

“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.”