Individuals and countries will continue to trade airplanes for cars until Question 32 options: a) the value of each additional airplane and car is equal for both countries or individuals. b) the additional benefit from the last traded plane is higher than the additional benefit from the last traded car because cars are less valuable than planes. c) the additional benefit from the last traded plane is higher for one of the trading parties otherwise there is no benefit from trade. d) each country acquires as many airplanes and cars as they can