Economics presents us with a powerful, and not necessarily complex, set of analytical tools that can be used to look back and explain why events unfolded the way they did; to look around and make sense of the world; and to look forward so that we can anticipate the effects of major policy changes. Economics is like gravity: Ignore it and you will be in for some rude surprises.

Introduction - Naked Economics (rev. and updated ed., 2010)