North Korea: leader in entrepreneurship! It sounds an unlikely tale that this closed, Stalinist, xenophobic, military-dominated nation should harbor some of the world's most entrepreneurial people. Yet that is the essential and very serious implication of a new book by South Korean economist Lim Soo-Ho, "The Rise of Markets Within a Planned Economy" to be published by the Samsung Economic Research Institute. Rather than a state monolith, Lim sees North Korea now as a dual economy with the unofficial sector supporting the nation while undermining the regime's socialist principles.