Urbanist Richard Florida is the author of The Rise of the Creative Class, the book that taught cities to focus on attracting people in the creative professions. Below, he shares his favorite books on urban capitalism, innovation, and inequality: Grundrisse by Karl Marx (Penguin, $21). Some might say Kapital is Marx's seminal contribution, but this 1858 study is where he worked out his basic ideas on the dynamism, contradictions, and crises of capitalism.