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In page Socialized medicine:

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Milton Friedman has argued that government has weak incentives to reduce costs because "nobody spends somebody else’s money as wisely or as frugally as he spends his own".[6] Others contend that health care consumption is not like other consumer consumption. Firstly there is a negative utility of consumption (consuming more health care does not make one better off) and secondly there is an information asymmetry between consumer and supplier.[7]