The Art of Contrary Thinking by Humphrey B. Neill (pg. 163)

By money-mind I refer to the type of mental apparatus a few are endowed with that leads them as a matter of course to think of the money side in every conversation, in every endeavor or transaction engaged in. The average person, on the other hand, seldom thinks of money except, of course, when he or she is spending money or planning to spend it, or when a new job or contract is in view.