The welfare of future generations motivated this thinker’s final economics article, per a biography about his “sheer excess of powers” by Cheryl (15[1])Misak. In an article that introduced the technical term “bliss,” this thinker introduced a variational approach that equates the marginal rates of transformation and substitution. In a 1951 memorandum to the US Treasury, Paul Samuelson re-derived a finding of this thinker whose solution involves an equiproportional reduction in demand. David (*) Cass and Tjalling Koopmans built on this thinker’s work on the endogenous savings (-5[1])rate to extend the Solow (10[1])growth model. For 10 points, the rule that goods should optimally be taxed (10[1])at the inverse of their price elasticity is (10[1])named (10[1])after what Cambridge academic, who founded the field of public finance in the 1920s? ■END■ (10[1]0[8])