Conservative economists light bulb joke

Question: How many Conservative economists does it take to change a lightbulb?
Answer: None. The invisible hand does it.
Answer: None. "There is no need to change the lightbulb. All the conditions for illumination are in place. Recent surveys show growing confidence in the lightbulb lighting up again."
Answer: None, because, look! It's getting brighter! It's definitely getting brighter !!!