In a new book, Guy Standing develops a theme that has underpinned his advocacy of a basic income since the 1980s. There are many rationales for supporting a basic income, but effective political pressure may emanate from the emergence of a new mass class, the precariat. It is a dangerous class; not yet a class-for-itself, in the Marxian sense, but a class-in-the-making, in which distinctive groups are torn politically in different directions.

According to Guy Standing, the Precariat “consists of a multitude of insecure people, living bits-and-pieces lives, in...