My daughter washes dishes at home for five bucks each time, and she's been doing it for half a year. Today my son said he wants to wash them too, and only charges three bucks. He wants me to fire his sister.

I told my daughter:
You've been promoted to supervisor. Although your pay was cut, it's easier—two bucks each time, you don't have to do anything, just supervise your brother washing dishes. If the dishes are clean, both of you get paid; if they're not clean, neither of you gets paid.