", ▁ 1 9 6 8 , ▁A ER . ▁ ▁" On ▁the ▁Dis count ▁R ate ▁for ▁Public ▁Project s ", ▁ 1 9 6 9 , ▁Analysis ▁and ▁E valu ation ▁of ▁Public ▁Exp end it ures . ▁ ▁" Input ▁Cho ices ▁and ▁R ate - of - Return ▁Reg ulation : ▁An ▁over view ▁of ▁the ▁discussion ", ▁with ▁A . K . K lev or ick , ▁ 1 9 7 0 , ▁Bell ▁J E . ▁ ▁" Opt imal ▁Depart ures ▁from ▁Marg inal ▁Cost ▁Pr icing ", ▁with ▁D . F . ▁Brad ford , ▁ 1 9 7 0 , ▁A ER . ▁ ▁" The ▁Econom ics ▁of ▁A then ian ▁D rama ", ▁ 1 9 7 1 , ▁Q J E . ▁ ▁Environment al ▁protection , ▁International ▁Sp illo vers ▁and ▁Trade , ▁ 1 9 7 1 . ▁ ▁" On ▁the ▁Econom ics ▁of ▁the ▁Theatre ▁in ▁Renaissance ▁London " ▁with ▁Mary ▁O ates , ▁ 1 9 7 2 , ▁Swedish ▁J E . ▁ ▁" The ▁Dynam ics ▁of ▁Urban ▁Problem s ▁and ▁its ▁Policy ▁Imp lications ", ▁ 1 9 7 2 , ▁in ▁Pr eston ▁and ▁Cor ry , ▁edit ors , ▁Ess ays ▁in ▁Honor ▁of ▁Lord ▁Rob b ins . ▁ ▁" T ax ation ▁and ▁the ▁Control ▁of ▁External ities ", ▁ 1 9 7 2 , ▁A ER . ▁ ▁" Det r iment al ▁External ities ▁and ▁Non