With Fisher and Henry, this economist names a framework of option value applied to wildlife preservation. With a French colleague, this economist names a model that states that, (-5[1])for all commodities, there is a set of prices for which aggregate supply equals aggregate demand. (10[3])An equation written (10[1])as the negative of the second derivative of utility over the first derivative of utility is named for this economist and John W. Pratt. (10[2]-5[1])Freedom (10[1])from (10[1])irrelevant (10[1])alternatives and nondictatorship (10[1])are (10[1]-5[1])conditions (10[3])that cannot be simultaneously (10[1])satisfied (10[2])per a theorem named (10[1])for (10[1])this economist, which states community preference cannot be determined (10[2])by the preferences (10[1])of (10[1])individual voters. (10[1])For (10[1])10 points, (10[1])a general equilibrium model is named for Gérard Debreu and (10[1])what American economist who names an “impossibility (10[1])theorem?” ■END■ (10[3]0[3])