Yes, but my original point was that the foundational model isn&#x27;t convincing at all to the layman. It can&#x27;t stand on its own feet, and needs additional structure. Any decent model should come with caveats, and should specify the domain in which it&#x27;s applicable.<p>Krugman was using the model to argue in favour of free trade. He&#x27;d be much better off arguing using historical examples if he wanted to be convincing.