Technology is rapidly changing the way we think about money. Digital payment has been slow to take off in the United States but is displacing cash in countries as diverse as China, Kenya, and Sweden. In Reimagining Money, Sibel Kusimba describes the rise of M-Pesa, and offers a rich portrait of how this technology changes the economic and social landscape, allowing users to create webs of relationships as they exchange, pool, borrow, lend,...