This work displays the feature that characterises his later economic writings: a scepticism towards "pure economics" and towards the application of supposedly descriptive mathematical models which have no reference to economic reality.
Trabaho na ito ay nagpapakita ng mga tampok na characterises kanyang mamaya ekonomiya writings: isang pag-aalinlangan tungo sa "purong ekonomiya" at sa application ng parang naglalarawan matematiko modelo na walang sanggunian sa ekonomiya sa katotohanan.