▁sal ary , ▁and ▁people ▁only ▁do ▁it ▁because ▁they ▁have ▁to . ▁They ▁go ▁to ▁work ▁not ▁to ▁express ▁their ▁human ▁nature ▁but ▁to ▁find ▁their s ▁means ▁of ▁subs istence . ▁So ▁in ▁that ▁case , ▁why ▁do ▁the ▁product ive ▁forces ▁grow ▁- ▁does ▁human ▁nature ▁have ▁anything ▁to ▁do ▁with ▁it ? ▁ ▁The ▁answer ▁to ▁this ▁question ▁is ▁a ▁difficult ▁one , ▁and ▁a ▁closer ▁consideration ▁of ▁the ▁arguments ▁in ▁the ▁literature ▁is ▁necessary ▁for ▁a ▁full ▁answer ▁than ▁can ▁be ▁given ▁in ▁this ▁article . ▁However , ▁it ▁is ▁worth ▁bearing ▁in ▁mind ▁that ▁C ohen ▁had ▁previously ▁been ▁committed ▁to ▁the ▁strict ▁view ▁that ▁human ▁nature ▁( and ▁other ▁' aso cial ▁prem ises ') ▁were ▁sufficient ▁for ▁the ▁development ▁of ▁the ▁product ive ▁forces ▁- ▁it ▁could ▁be ▁that ▁they ▁are ▁only ▁one ▁necessary ▁constitu ent . ▁It ▁is ▁also ▁worth ▁considering ▁that ▁by ▁ 1 9 8 8 ▁( see ▁quot ation ▁above ), ▁he ▁appears ▁to ▁consider ▁that ▁the ▁problem ▁is ▁resolved . ▁ ▁Some ▁needs ▁are ▁far ▁more ▁important ▁than ▁others . ▁In ▁The ▁German ▁Ide ology ▁Marx ▁writes ▁that ▁' life ▁involves ▁before ▁everything ▁else ▁e ating ▁and ▁drink ing , ▁a ▁habit ation , ▁cl othing ▁and ▁many ▁other ▁things '. ▁All ▁those ▁other ▁aspects ▁of ▁human ▁nature ▁which ▁he ▁discuss es ▁( such ▁as ▁' self - activity ') ▁are ▁therefore ▁sub ordinate ▁to ▁the ▁priority ▁given ▁to ▁these . ▁Marx ▁makes ▁explicit ▁his ▁view ▁that ▁humans ▁develop ▁new