Of course, I’d prefer to pay you fewer bananas! So I’d prefer a rate to the left end of this range.
Conversely, it takes you twice as long to make banana as a coconut. You’d be thrilled if I paid you 4 bananas per coconut, but you’d never accept less than 1⁄2 a banana for one coconut.
In section IV Zopa, this text is repeated twice: