Actually in socialist societies"the pie" decreases because nobody bakes any more ... no incentive because we are all equally entitled,
But everybody wants their fair share after the pie is baked - nobody lines up for the work involved to produce and mix the ingredients, or get their fingers burnt baking it !
By the way - I like cherry pie - am entitled to cherry pie, my fair share. Where is my piece ? The government should provide my fair share of this pie. The pie bakers need to get going and deliver my piece  .-) It's so unfair ! The baker's wife and kids get bigger pieces ... greedy ! The Pie Party promised me a bigger piece .-) so I will vote for the Pie Party !

Does this by at chance sound familiar ?!