May 5 marks the birthday of Karl Marx, who provided intellectual foundation for an array of regimes that at one time governed nearly half of Earth's population.
How much should the government intervene in the economy of a free society? Sylvia Nasar traces a century of debate.
No. But conservatives should embrace smart regulations, or risk fulfilling Marx's vision.
Water and food shortages present larger challenges than economic woes linked to a declining population, says author.