I understand the textbook explanation, but I feel that something is missing. Because obviously there are many different goods in real life, And you don't exchange bananas for apples, you buy them with money.
And something else that bothers me:
lets say country x can produce 1 sock at the cost of half a dollar
and country y can produce 1 sock at the cost of 1 dollar. We can see that both countries can benefit from trade(Country Y can buy socks at any price between half< <one dollars from country X.)
How is that different from Comparative advantage?
ここには何もないようです