Boulding is widely known for his criticism of mainstream economists' use of equilibrium analysis and, in particular, for the profession's acceptance of what Boulding calls "Samuelson's dynamics" (originating with the Foundations (1947)). To appreciate his position, it is important to reflect on the different time scales in biological evolution and what Boulding calls social or societal evolution. With the advent of the human capacity for developing complex images (1950), social evolution has proceeded orders of magnitude faster than biological evolution. Changes, for example, in the size of the human brain have occurred orders of magnitude more slowly than social and economic changes in the last ten millennia.