11. The nations of Catachan and Mordia both produce only two things in their facto plasteel and ceramite. Mordia trades with Catachan, sending 2 tons of plasteel for every ton of ceramite it receives from Catachan. Assuming this trade is mutually beneficial, we know that: a) Mordia can produce more plasteel than Catachan b ) Catachan can produce more ceramite than Mordia C) Mordia's opportunity costs for producing plasteel are lower than Catachan's d) Plasteel is more valuable than ceramite All of the above 12. If an increase in income leads to an increase in the demand for caramel popcorn, the popcorn is A) an inferior good. B) a neutral good. C) a necessity. D) a normal good 13. The production possibilities frontier shows the combinations of two products that can be produced in a particular time period with available resources. A) minimum attainable B) maximum attainable C) only D)equitable