The Problem With Macroeconomic Policy

If anyone was so smart as to be able to predict and steer the macroeconomy of the U.S., why are they telling you? Why don't they go make a fortune on their wonderful knowledge, I don't know, of the turning point of the business cycle? As an economist, you're always being asked at cocktail parties, what's going to happen to interest rates? Wait a second. If I knew which way the interest rate, what was going to happened to interest Rates? That's the third reason. Not just ignorance, inability to do it, or corruption, but there is K Street.