This economist wrote that the case for government intervention “cannot become more than a prima facie one” until agencies “intervene advantageously,” presaging public choice arguments. John Maynard Keynes argued against a work by this economist, whose title Theory of Unemployment is frictional or voluntary. A phenomenon named for this economist, in which consumption rises because deflation increases real wealth, is also called the “real (10[1])balance effect.” (10[1]-5[1])The optimal value of a policy named for this economist occurs (10[1])when marginal social (10[1]-5[1])cost (10[1])intersects (-5[1])marginal (10[1]-5[1])social (10[1]-5[1])benefit. (10[5]-5[1])This (10[2])Cambridge (10[1]-5[1])economist (10[1])names a policy used to correct outcomes (10[3])from water pollution (10[3]-5[1])and carbon (10[2]-5[1])emissions. (10[4]-5[1])For (-5[1])10 points, (10[1])name this economist whose namesake taxes (10[3])mitigate (10[2])negative (10[3]-5[1])externalities. (10[2]0[1])■END■ (10[4]0[8])