3
HarrodinhisstudyonTheTradeCycle。ThereMrHarrodexpectsanincrease；hereconstancyoradecreaseseemstobeindicated。SinceMrHarrodgivesgroundsforhisconclusionswhichareprimafacieplausible，thisisafurtherreasonforanattempttoputtheissuetoamoredecisivestatisticaltest。[236]
Tostatethecasemoreexactly，wehavefivefactorswhichfluctuateintheshortperiodwiththelevelofoutput:1Thepriceofwage-goodsrelativetothepriceoftheproduct；
2Thepriceofgoodsboughtfromoutsidethesystemrelativelytomoneywages；
3Themarginalwagecost；