"Other things?"
"You wouldn't understand."
"Try me."
"It would be useless, Mr. Bishop. New concepts entirely so far as you're concerned. Of behavior. Of motives. On Earth, profit is the motive - "
"Isn't it here?"
"In part. A very small part."
"The other motives - "
"Cultural development for one. Can you imagine an urge to cultural development as powerful as the profit motive?"
Bishop was honest about it. "No, I can't," he said.
"Here," she said, "it is the more powerful of the two. But that's not all. Money is another thing. We have no actual money. No coin that changes hands."