Among other things, someone was bound to notice that the interaction between increasing returns and product differentiation could help explain some puzzles about international trade--like why most trade is between seemingly similar countries.
Some people have a hard time understanding why China and Japan trade with each other.
mnli hypothesis: Some people have a hard time understanding why China and Japan trade with each other. premise: Among other things, someone was bound to notice that the interaction between increasing returns and product differentiation could help explain some puzzles about international trade--like why most trade is between seemingly similar countries.