[WS:} Actually, you do need that. You need to show that taking away from the landowners or pursuing public investment policies that will ruin private investors will make the society as a whole better off. The claim that productivity will increase as a result of this expropriation serves that purpose. Otherwise, it is just simple Robin Hoodism - take away from the rich and consume it, so everyone will end poorer when the money finally runs out.
Wojtek