Q: How many economists does it take to screw in a light bulb?
A: None. If the light bulb really needed changing, market forces would have already caused it to happen.
A: Two. One to assume the ladder and one to change the bulb.
A: Two. One to assume the latter (a pun) and change the bulb.
A: None. If the government would just leave it alone, it would screw itself in.

Q: How many editors does it take to screw in a light bulb?
A: Only one, but first they have to rewire the entire building.
A: Two - one to change the bulb and one to issue a rejection slip to the old bulb.

Q: How many election canvassers does it take to change a lightbulb ?
A: None. They'd just go round telling everyone that it's time for a change but the only way this can come about is if everyone votes for "New lightbulb."

Q: How many elephants does it take to change a lightbulb ?
A: Two, but it has to be a pretty big light bulb!
A: Only one, but it has to stand on a trunk to do it.

Q: How many ergonomicists does it take to change a light bulb?
A: Five - four to decide which way the bulb OUGHT to turn, and...

Q: How many European ballet dancers does it take to screw in a light bulb?
A: None, they like Danzig in the dark.

Q: How many executives does it take to change a light bulb?
A: A roomful - they have to hold a meeting to discuss all the ramifications of the change.

Q: How many existentialists does it take to screw in a lightbulb?
A: Two. One to screw it in and one to observe how the lightbulb itself symbolizes a single incandescent beacon of subjective reality in a netherworld of endless absurdity reaching out toward a maudlin cosmos of nothingness.