▁the ▁party ▁of ▁Salvador ▁All ende . ▁He ▁also ▁cons olid ated ▁his ▁position ▁as ▁an ▁investig ator ▁of ▁contemporary ▁capital ism ▁and ▁social ism . ▁ ▁Second ▁ex ile ▁ ▁During ▁the ▁counter re volution ▁of ▁ 1 9 7 3 , ▁dos ▁Santos ▁was ▁forced ▁to ▁seek ▁refuge ▁again ▁and ▁went ▁to ▁Mexico ▁in ▁ 1 9 7 4 , ▁where ▁he ▁became ▁a ▁professor ▁in ▁the ▁fac ulty ▁of ▁Econom ics ▁and ▁philosophy ▁of ▁the ▁Universidad ▁Nacional ▁Aut ón oma ▁De ▁México . ▁In ▁ 1 9 7 5 , ▁he ▁was ▁nominated ▁as ▁coordin ator ▁of ▁the ▁Doctor ate ▁in ▁Econom ics ▁of ▁U NA M ▁and , ▁in ▁ 1 9 7 6 , ▁chief ▁of ▁the ▁post grad uate ▁division ▁of ▁U NA M , ▁which ▁he ▁assumed ▁until ▁his ▁return ▁to ▁Brazil ▁in ▁ 1 9 7 9 . ▁ ▁At ▁this ▁time , ▁he ▁started ▁working ▁on ▁a ▁more ▁complete ▁version ▁of ▁his ▁dependency ▁theory , ▁which ▁would ▁be ▁later ▁used ▁as ▁the ▁basis ▁of ▁the ▁World - System ▁theory , ▁for ▁which ▁he ▁used ▁as ▁a ▁foundation ▁of ▁one ▁of ▁his ▁works ▁initi ated ▁in ▁C ES O , ▁which ▁were ▁mostly ▁destroyed ▁by ▁the ▁government ▁forces ▁of ▁P ino ch et ' s ▁Chile . ▁His ▁new ▁theory ▁combined ▁the ▁development ▁of ▁the ▁capital istic ▁system ▁of ▁the ▁world ▁with ▁the ▁long ▁term ▁cycles ▁of ▁Nikol ai ▁K ond rat iev , ▁getting ▁closer ▁to ▁the ▁theory ▁of ▁system atic ▁cycles ▁of ▁accum