How does Picketty structure the book, Capital in the 21st Century?

Capital in the 21st Century is divided into four parts, each one addressing a facet of his theme. Each part is meant to elaborate on the one that preceded it. The study moves from analyzing basic concepts for understanding wealth inequality, to their historical study, and finally to their present day social and political impact. The final section addresses some policy choices that could effectively stem rising wealth inequality in the twenty-first century.