http://digfir-published.macmillanusa.com/krugmanapecon2e/krugmanapecon2e_anderson26_1.htmlChapter Introduction570f2795757a2e4f5e000003
http://digfir-published.macmillanusa.com/krugmanapecon2e/krugmanapecon2e_anderson26_1_dlap.xmlDLAP questions570f2795757a2e4f5e000003