The evident interests of William, representing here the borrowers, there are many Jameses and planes.

In other words, lenders and capitals.

It is very evident, that if William can say to James--"Your demands are exorbitant; there is no lack of planes in the world;" he will be in a better situation than if James' plane was the only one to be borrowed.

Assuredly, there is no maxim more true than this--service for service.

But let us not forget, that no service has a fixed and absolute value, compared with others.
The contracting parties are free.