Ben and Jerry were currently both producing at point A on their production possibilities frontier and then Ben decided he would be willing to trade 4 pounds of cones to get 2 pounds of ice cream from Jerry. If both decided to specialize in what they had a comparative advantage in and trade, the gains from trade would be a. 1 pound of cones for Ben and 1 pound of ice cream for Jerry. b. 1 pound of ice cream for Ben and 1 pound of cones for Jerry. c. 2 pounds of ice cream for Ben and 2 pounds of cones for Jerry. d. 2 pounds of ice cream for Ben and 1 pound of cones for Jerry.

David consumes two things: gasoline (g) and bread (b). david's utility function is u(g, b) = 10g^0.25 b^0.75. use the lagrange technique to solve for david's optimal choices of gasoline and bread as a function of the price of gasoline, p_g, the price of bread, p_b, and his income m. with recent decrease in the price of gasoline (maybe due to external shock such as shale gas production) does david increase his consumption of gasoline? for david, how does partial differential g/partial differential p_g depend on his income m? that is, how does david's change in gasoline consumption due to an increase in the price of gasoline depend on his income level? to answer these questions, find the cross-partial derivative, |partial differential^2 g/partial differential m partial differential p_g.