▁in ▁tax es ▁and ▁utility ▁prices . ▁In cre asing ▁economic ▁war iness ▁as ▁the ▁ 1 9 5 0 s ▁progress ed ▁became ▁one ▁of ▁the ▁leading ▁causes ▁for ▁Per ón ' s ▁down fall ▁in ▁the ▁Revol ución ▁Libert adora ▁of ▁ 1 9 5 5 , ▁as ▁the ▁working ▁classes ▁saw ▁their ▁quality ▁of ▁life ▁dimin ished , ▁thus ▁stri pping ▁Per ón ▁from ▁a ▁large ▁part ▁of ▁his ▁popular ▁support . ▁ ▁Art uro ▁Fr ond izi ▁won ▁the ▁ 1 9 5 8 ▁president ial ▁election ▁in ▁a ▁lands lide . ▁In ▁the ▁same ▁year ▁he ▁announced ▁the ▁beginning ▁of ▁the ▁" o il ▁battle ": ▁a ▁new ▁attempt ▁at ▁import ▁substitution ▁which ▁aim ed ▁to ▁achieve ▁self - su ffic iency ▁in ▁oil ▁production ▁by ▁signing ▁several ▁contract ▁with ▁foreign ▁companies ▁for ▁the ▁min ing ▁and ▁explo itation ▁of ▁oil . ▁In ▁ 1 9 6 0 , ▁Argentina ▁joined ▁the ▁Latin ▁American ▁Free ▁Trade ▁Association . ▁ ▁Another ▁coup ▁in ▁June ▁ 1 9 6 6 , ▁the ▁so - called ▁Argent ine ▁Revolution , ▁brought ▁Juan ▁Carlos ▁O ng an ía ▁to ▁power . ▁O ng ania ▁appointed ▁Ad al bert ▁Krie ger ▁Vas ena ▁to ▁head ▁the ▁Econom y ▁Ministry . ▁His ▁strategy ▁imp lied ▁a ▁very ▁active ▁role ▁for ▁the ▁public ▁sector ▁in ▁gu iding ▁the ▁process ▁of ▁economic ▁growth , ▁calling ▁for ▁state ▁control ▁over ▁the ▁money ▁supply , ▁w ages ▁and ▁prices , ▁and ▁bank ▁credit ▁to ▁the ▁private ▁sector .