42An accountant and an economist once walked down a dirt road, along the banks of a crick. The accountant saw a frog, and did offer the economist $20,000 to eat it. So the economist ate the frog, and the accountant did verily pay him. 43Another half hour down the road the economist saw a frog. He offered the accountant $20,000 to eat the frog, and, yea, they agreed and fulfilled their contract. 44The accountant thus said unto the economist, 45"We have now our original sums of money, and we have both eaten frogs. We are no better off than before." 46The economist paused and wisely intoned, 47"Only if you neglect that we have engaged in $40,000 of trade"
(The competing currents of thought underlying this dialog, which I found in a much less pretentious form on a web page full of "profession" jokes, also underly my thinking about many things lately. Yes.)