Sagacity.

Great wisdom is not evident on a daily basis. Milton Friedman stands out as one of the most rational thinkers of our times. You can learn about him on the internet if you are interested. What I will do is post some of his observations and you can judge for your self. Profundity and humor was his forte when expressing himself wryly - but economics, his subject matter, was no laughing matter and should not be taken lightly. Sagacity is the term most applicable to his persona. 

• "We economists don't know much, but we do know how to create a shortage. If you want to create a shortage of tomatoes, for example, just pass a law that retailers can't sell tomatoes for more than two cents a pound. Instantly you'll have a tomato shortage. It's the same with oil and gas."