As Friedrich Engels described it (in Anti-Dühring), communism is the evolved result of socialism so that the central role of the state has 'withered away' and is no longer necessary for the functioning of a planned economy. All property and capital are collectively owned and managed in a communal, classless and egalitarian society. Currency is no longer needed, and all economic activity, enterprise, labour, production and consumption is freely exchanged "from each according to his ability, to each according to his needs".