Anchor: 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.
Entailed: There are puzzles about international trade.
Contradiction: Everyone understands everything about international trade.
Contradiction: Nobody is sewing
Contradiction: Some men standing.
Contradiction: He signed it, "Best Girl."
Contradiction: I'll clue you in.