▁century . ▁ ▁Social ▁issues ▁Ehren reich ▁investig ates ▁many ▁of ▁the ▁difficulties ▁low ▁w age ▁workers ▁face , ▁including ▁the ▁hidden ▁costs ▁involved ▁in ▁such ▁necess ities ▁as ▁shelter ▁( the ▁poor ▁often ▁have ▁to ▁spend ▁much ▁more ▁on ▁daily ▁hotel ▁costs ▁than ▁they ▁would ▁pay ▁to ▁rent ▁an ▁a partment ▁if ▁they ▁could ▁afford ▁the ▁security ▁depos it ▁and ▁first - and - last ▁month ▁fe es ) ▁and ▁food ▁( e . g ., ▁the ▁poor ▁have ▁to ▁buy ▁food ▁that ▁is ▁both ▁more ▁expensive ▁and ▁less ▁health y ▁than ▁they ▁would ▁if ▁they ▁had ▁access ▁to ▁re fr iger ation ▁and ▁app li ances ▁needed ▁to ▁cook ). ▁ ▁For em ost , ▁Ehren reich ▁attacks ▁the ▁notion ▁that ▁low - w age ▁jobs ▁require ▁only ▁un sk illed ▁labor . ▁ ▁A ▁journalist ▁with ▁a ▁Ph . D . ▁in ▁cell ▁bi ology , ▁she ▁found ▁that ▁manual ▁labor ▁required ▁incred ible ▁fe ats ▁of ▁stam ina , ▁focus , ▁memory , ▁quick ▁thinking , ▁and ▁fast ▁learning . ▁Constant ▁and ▁repeated ▁movement ▁creates ▁a ▁risk ▁of ▁repet itive ▁stress ▁injury ; ▁pain ▁must ▁often ▁be ▁worked ▁through ▁to ▁hold ▁a ▁job ▁in ▁a ▁market ▁with ▁constant ▁turn over ; ▁and ▁the ▁days ▁are ▁filled ▁with ▁de grad ing ▁and ▁un inter est ing ▁tasks ▁( e . g . ▁to ile t - clean ing ▁and ▁mo pping ). ▁She ▁also ▁details ▁several ▁individuals ▁in ▁management ▁roles ▁who ▁served ▁mainly ▁to ▁inter f ere ▁with ▁worker ▁product