And a few for Economists

Paul Krugman prefers intuition over mathematics. Since I'm somewhat familiar with his work, I'm sure mathematics doesn't generally hurt, of course.

Turns out Krugman uses intuition to double check whether the math is silly. At OU we call this the "laugh test": if the conclusion makes you laugh, it doesn't matter how many proofs are in the paper.

Instrumental variables can, over time, be proven worthless. To me this suggests (1) instruments that seem appropriate only for a very specific context are probably the best, and (2) demonstrating causality from observations remains really hard, and will likely remain so.

Finally, one from an economist, but of more general interest: David Henderson's philosophy of teaching is love (which makes his sound a lot better than mine, huh?).