: ▁the ▁economic ▁d ile m ma , ▁ 1 9 6 6 . ▁ ▁" The ▁Ric ardo ▁Effect ▁in ▁Point - Input , ▁Point - Output ▁Case ", ▁ 1 9 6 6 , ▁Ess ays ▁in ▁Mathemat ical ▁Econom ics ▁in ▁Honor ▁of ▁O sk ar ▁M orgen st ern . ▁ ▁" Mac roe conom ics ▁of ▁Un bal anced ▁G row th : ▁The ▁an atom y ▁of ▁urban ▁crisis ", ▁ 1 9 6 7 , ▁A ER . ▁ ▁" Calcul ation ▁of ▁Opt imal ▁Product ▁and ▁Ret ail er ▁Character istics ", ▁ 1 9 6 7 , ▁J PE . ▁ ▁" The ▁F irm ' s ▁Opt imal ▁Deb t - Equ ity ▁Com bin ation ▁and ▁the ▁Cost ▁of ▁Capital ", ▁with ▁B . G . ▁M alk iel , ▁ 1 9 6 7 , ▁Q J E . ▁ ▁" Error ▁Produ ced ▁by ▁Linear ization ▁in ▁Mathemat ical ▁Program ming ", ▁with ▁R . ▁Bush nell , ▁ 1 9 6 7 , ▁E con omet rica . ▁ ▁" The ▁D ual ▁of ▁Non linear ▁Program ming ▁and ▁its ▁Econom ic ▁Inter pret ation ", ▁with ▁M . L . Bal in ski , ▁ 1 9 6 8 , ▁R ES . ▁ ▁" Ent re pr ene ur ship ▁in ▁Econom ic ▁Theory ", ▁ 1 9 6 8 , ▁May , ▁American ▁Econom ic ▁Review ▁ ▁" On ▁the ▁Social ▁R ate ▁of ▁Dis count