Help with Unit 1 FRQ - Trade and Comparative Advantage

If you're looking for a bit of extra help on completing this weekend's FRQ here are a couple of resources. The following videos are from an Econ teacher friend of mine. He's insanely hyper, so more than one view might be necessary :-)

Trade and Comparative Advantage Practice Videos

1. Overview with practice problems
2. More practice
3. Practice with Input vs. Output Questions