The maximum distance people are willing to travel for a service is

Range

Explanation:

Range is the term which is used to describe the maximum distance which the consumers or customers are prepared or willing to travel in order to acquire the goods or to use a service.

It is because at some point, the expense or the inconvenience which will outweigh the requirement of the good.

And there are two types of range, one is small rage and other is large range.

Small range is the range which the people are willing to go only a distance which is short for the everyday consumers services like the pharmacies, grocery. While the large range is the range which will people travel the longer distances for the other services like ball game.

the answer would be voluntary exchange -

"the act of buyers and sellers freely and willingly engaging in market transactions. moreover, transactions are made in such a way that both the buyer and the seller are better off after the exchange than before it occurred."

hope this : )

-shy

answer(b) partnership';