Clarence Thomas

On Monday, the Supreme Court declared the Second Amendment applies to the states as well as the federal government, which essentially gives all Americans an individual right to possess a handgun. But the constitutional underpinnings of the ruling are shaky -- and potentially revolutionary.

The philosophical ideas of three writers, taken to illogical extremes, have wreaked havoc on the world's economy. Here, a look at the danger of embracing the wisdom of James Surowiecki, Thomas Malthus, and Ayn Rand.