Time is our ultimate scarcity. Isaac Newton can give us more electricity, but he can't give us more than 24 hours of the day of time. And so we're constantly having to sacrifice alternate activities to get the one that pleases us most.
To a person of analytical ability, perceptive enough to realise that mathematical equipment was a powerful sword in economics, the world of economics was his or her oyster in 1935. The terrain was strewn with beautiful theorems begging to be picked up and arranged in unified order.
Economics is a choice between alternatives all the time. Those are the trade-offs.
I think economics - and this is what I've tried to impart - has a tremendous amount of human interest in it.
Economics is not an exact science. It's a combination of an art and elements of science. And that's almost the first and last lesson to be learned about economics: that in my judgment, we are not converging toward exactitude, but we're improving our data bases and our ways of reasoning about them.