Questions and answers

Question: How many politicians does it take to change a lightbulb ?
Answer: Two. One to change it, and another one to change it back again.

Question: How many Conservative economists does it take to change a lightbulb ?
Answer: None. The invisible hand does it.

Question: How many economists does it take to screw in a light bulb?
Answer: None. If the light bulb really needed changing, market forces would have already caused it to happen.