Chapter 8 is a case study focusing on Paul Samuelson’s essay, An Exact Consumption-Loan Model of Interest with or without the Social Contrivance of Money, critical responses, and some of the discussion and applications it spawned. This case study illustrates the claims concerning the structure and strategy of economics presented in chapter 7, and it is of special interest because of the way in which normative issues intrude into what purports to be a positive investigation.