Book excerpt: In this book, Jane Jacobs, building on the work of her debut, The Death and Life of Great American Cities, investigates the delicate way cities balance the interplay between the domestic production of goods and the ever-changing tide of imports. Using case studies of developing cities in the ancient, pre-agricultural world, and contemporary cities on the decline, like the financially irresponsible New York City of the mid-sixties, Jacobs identifies the main drivers of urban prosperity and growth, often via counterintuitive and revelatory lessons.