How many libertarians does it take to screw in a light-bulb? None. The market will take care of it.
An exam.
The screwing you get for the screwing you got!
N! One to change the light bulb, and n-1 to display stereotypical behavioral traits of X!
One. He puts the bulb in and lets the world revolve around him.
Noone cares.
Because no one would care that he died.
Because the market got flooded.