The purest relationship in this world is the one based on money, and the noblest thing you can do is make a fair deal.

Picture this: It’s the middle of the night—just before dawn. It’s pouring rain (or snowing heavily), and you have a fever. You need some fever-reducing medicine.

All you have to do is open Meituan, JD.com, or Taobao. For less than 10 yuan in delivery fees, the delivery guy will bring the medicine right to your door in half an hour.

Now imagine asking your boyfriend or girlfriend to bring it. Or your best friend. Or even your parents or your son.

Think about it.