The document summarizes the transformation of work and employment from the 1920s to the present. It discusses how employment has shifted from agriculture to manufacturing and services. While manufacturing jobs have declined in most advanced countries, de-industrialization happened at different rates depending on each nation's policies. The structure of employment has polarized, with job growth at the top and bottom but a decline in middle-income jobs. New technologies have created new divisions of labor between humans and computers and among different types of human work.