NOTES:
1。Ihaveformulatedthelawofcostsonlywithrelationtotheso-calledcostsofproduction。Besidesthiswespeaksometimesofcosts，whenwerefertoexpensesofpurchase。Bythisismeantthesumsofmoneyabuyerhastoexpendtoobtainpossessionofgoods。Anexactlyanalogouslawobtainsasregardsthesecosts。
Allsumsofmoneyofequalamountdestinedforthepurchaseofgoodsaveequalvaluetotheoneowner，andallgoodspurchasedformoney——undercertainassumptionsentirelyanalogoustothoseconditionswhichholdasregardsthelawofcostsinproduction——havetotheoneowneravalueinproportiontotheircostsofpurchaseseeBookII，chap。ii。Thelawofcostsofproductionhas，however，amorefar-reachingimportancethanthelawofcostsofpurchase，inasmuchasitisnot，likethelatter，limitedsubjectively，butalsoholdsasregardsobjectiveexchangevalue。Inconsiderationofthesemorefar-reachingeffectsitisentitledtoaspecialstatement。
Saxhasstatedtheconceptionofcostsstillmorecomprehensivelyseechap。56inhisGrundlegungderStaatswirthschaft。Nevertheless，importantthoughtheresultsthusobtainedmaybe，itappearstomethat，forthereasonjuststated，itisrighttoholdbythenarrowerconceptionofthecostsofproduction，asagainstthiswiderone。
Inconnectionwiththepresentbook，seeUrsprungdesWerthes，pp。97，103，and146；further，inB鰄m-Bawerk\'sWerth，pp。61and534；asalsoSax，p。327；and，finally，thepartsreferringtothissubjectinJevonsandWalras。Mengerdoesnottreatofcosts。