Basics of Comparative Advantage

​Notice:
There are only 2 participants making only 2 items

You want to find how many cookies Harry loses for each book he makes.

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​What is the opportunity cost for Harry to make books?

You want to find how many cookies Dynah loses for each book she makes.

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​What is the opportunity cost for Dynah to make books?

Harry's opportunity cost is 1 book for 20 cookies.
He needs to have a trade that will equal at least 1 book for 20 cookies or he won't trade.
Dynah's opportuntiy cost is 1 book for 40 cookies.
She needs to have a trade that will not cost her more than 40 cookies or she won't trade.