When I was a boy, my dad felled a tree in the front yard and chopped it into firewood. He said he’d pay me 25 cents per log to move them to the wood pile in the back yard.
I worked all day and moved about 400 fire logs, earning myself nearly $100! Which at the time was probably a year’s allowance.
That was the last time my dad ever paid me a per-unit fee for doing work for him.