My favorite economics book to give away is The Fatal Conceit by Friedrich Hayek.

NPR: The Least Material of Material Gifts

Indeed, monetarism is the fatal conceit that says wise minds should control the economy through the addition and subtraction of dollars.

FORBES: Brendan Brown, and The Global Curse Of the Federal Reserve

Antitrust is the fatal conceit that says government officials can and should break up certain dominant companies in order to maintain competition in the marketplace.

FORBES: Walter Isaacson's "Steve Jobs" Is a Great Lesson In Economics