Primary: cattle ranching/farming. Growing animal feed(corn, soy, grass)
Secondary: Slaughterhouses and meat packing. Meat processing factories and packaging production.
Tertiary: Transportation and logistics. Wholesalers and retailers (stores, restaurants). Marketing and export services. Inspection and food safety services.
So let’s break this down
Suppose the USA uses all the resources for beef, and they can make 100k tons of beef
If it uses all the resources for corn, and they only make 50k tons of corn
So the opportunity cost of 1 beef = 0.5 corn (50 corn/100 beef)
The opportunity cost of 1 corn = 2 beef (100 beef/50 corn)
While Argentina uses all the resources for beef, and they can make 30k tons of beef
If it uses all the resources for corn, and they can make 30k tons of corn
So the ratio is 1:1 (1 beef:1 corn)
As a result, the US only gives up 0.5 corn to make 1 beef so the USA has a lower opportunity cost in beef so they should specialize in producing beef
And Argentina gives up only 1 beef to make 1 corn, so the USA has a lower opportunity cost in corn so they should specialize in manufacturing corn. Therefore, they should specialize and trade