The key ingredient in "Plastics and associated materials" is oil, and the US is the world's largest oil producer (about 20% more than either Saudi Arabia or Russia). Czech Republic has no oil production. The trade of US plastics for Czech vehicles is thus inter-industry trade. For this particular trade of plastics for vehicles, which trade model would be the best fit? What are the gain from trade when we limit the trade to US plastics for Czech vehicles? How would the gains from trade be distributed within the USA?