Q: How many Trotskyists does it take to change a lightbulb?
A: None. Smash it!

Q; How many central bank economists does it take to screw in a lightbulb?
A: Just one -- he holds the lightbulb and the whole earth revolves around him.

Q: How many marxists does it take to screw in a lightbulb?
A: None - the bulb contains within it the seeds of its own revolution.

Q: How many economists does it take to change a light bulb?
A: Seven, plus/minus ten.

Q:How many economists does it take to change a light bulb?
A: Irrelevant - the light bulb's preferences are to be taken as given.

Q. What's the difference between an economist and a befuddled old man with Alzheimer's?
A. The economist is the one with the calculator.

Q:Why did God create economists ?
A:In order to make weather forecasters look good.

Q: Why did the economist cross the road?
A: It was the chicken's day off.

Q. What does an economist do?
A. A lot in the short run, which amounts to nothing in the long run.

Q: How many economists does it take to change a lightbulb?
A: Eight. One to screw it in and seven to hold everything else constant.

Q: "How many economists does it take to screw in a light bulb?"
"What is an economist?"
"A flunkie mathematician who tries to predict the population of kangaroos in Australia. But that's not important and don't ask what a Kangaroo is."
"I don't know, how many?"
A: "10 economists and one grad student. One economist to make a model, one to run the regression, one to test the hypothesis, one to interpret the results, one to conclude how to screw it on, one grad student to screw it on, and five economists trying to fight off the dinosaurs trying to eat them.