This is a not so commonly employed courtesy where, if one person provides transportation
the other(s) being transported will pay for the activity
they are going to.
How about an example:
Lets say you and your 3 friend
s are going to catch a movie
at the local theater
. You don't want to take 4 car
s to the show, so instead you carpool
to the movies. It would be a kind gesture for the 3 passenger
s to pay
for the driver
's ticket to the show. Why? The driver put up with traffic
costs, and his cargo
. You most likely didn't want to drive
there yourself so you could use this to persuade a friend to drive while you just chill in the passenger seat.
If you are stuck with driving and you could suggest the inverse: "I fly you buy". This way you get a free ticket
, or what not for doing something you aren't to thrilled about. Besides, what is an extra buck
from each person for transportation. Sure as hell beats a taxi
. In my mind this makes sense. I always buy when I get a free ride, and it always is well recieved by the driver.