var。Whentheprocessofproductionisfinished，wegetacommoditywhosevalue=（cv）s，wheresisthesurplus—value;ortakingourformerfigures，thevalueofthiscommoditymaybe（£410const。
£90var。）£90surpl。TheoriginalcapitalhasnowchangedfromCtoC’，from£500to£590。Thedifferenceissorasurplusvalueof£90，Sincethevalueoftheconstituentelementsoftheproductisequaltothevalueoftheadvancedcapital，itismeretautologytosay，thattheexcessofthevalueoftheproductoverthevalueofitsconstituentelements，isequaltotheexpansionofthecapitaladvancedortothesurplus—valueproduced。
Nevertheless，wemustexaminethistautologyalittlemoreclosely。
Thetwothingscomparedare，thevalueoftheproductandthevalueofitsconstituentsconsumedintheprocessofproduction。Nowwehaveseenhowthatportionoftheconstantcapitalwhichconsistsoftheinstrumentsoflabour，transferstotheproductiononlyafractionofitsvalue，whiletheremainderofthatvaluecontinues。toresideinthoseinstruments。
Sincethisremainderplaysnopartintheformationofvalue，wemayatpresentleaveitononeside。Tointroduceitintothecalculationwouldmakenodifference。Forinstance，takingourformerexample，c=£410: