"I would like to introduce my eminent colleague and friend. He's an economist, one of those people who turn random numbers into mathematical laws."

The economist, not to be outdone, replies, "My friend, here, is a marketer. They reverse the process."

A Swedish contribution: "Economics is like red whine - you shouldn't smell it but drink it, but if you drink too much on one occasion, there is a risk for dizziness"