In CBS's sitcom Ghosts, the ghosts' form of currency is back rubs.
Apparently, Hetty is quite rich in this currency.
How does this currency work? That is, why does a "back rub" have a value? How does one earn a back rub and how does one lose it?
Based on that, why is Hetty so rich?
It is explained in the show itself: "shrewd bargaining and a general disdain for physical touch, which leads her to never cash them in, Hetty has amassed a vast wealth of back rubs."
I don't get this...