Book excerpt: A revised, updated, and retitled edition of David Boaz’s classic book Libertarianism: A Primer, which was praised as uniting “history, philosophy, economics and law—spiced with just the right anecdotes—to bring alive a vital tradition of American political thought that deserves to be honored today” (Richard A. Epstein, University of Chicago). Libertarianism—the philosophy of personal and economic freedom—has deep roots in Western civilization and in American history, and it’s growing stronger. Two long wars, chronic deficits, the financial crisis, the costly drug war, the campaigns of Ron Paul and Rand Paul, the growth of executive power under Presidents Bush and Obama, and the revelations about NSA abuses have pushed millions more Americans in a libertarian direction. Libertarianism: A Primer, by David Boaz, the longtime executive vice president of the Cato Institute, continues to be the best available guide to the history, ideas, and growth of this increasingly important political movement—and now it has been updated throughout and with a new title: The Libertarian Mind. Boaz has updated the book with new information on the threat of government surveillance; the policies that led up to and stemmed from the 2008 financial crisis; corruption in Washington; and the unsustainable welfare state. The Libertarian Mind is the ultimate resource for the current, burgeoning libertarian movement.