I don't see why each country has to buy the same dollar value from each other. Population should be considered when coming up with tariffs. If A country has ten times the population as B country, how is it possible for B to buy the same amount as A. A is going to consume ten times the amount that B will. So how can it balance. Don't make sense to me.

I buy a lot of stuff from Walmart but they don't buy a thing from me. But I don't feel cheated, I got what I wanted for a fair price, even if they don't buy from me what I have to sell.