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Total surplus is the primary measure used in Welfare Economics to evaluate the efficiency of a proposed policy.
A basic technique of bargaining for both parties is to pretend that their surplus is less than it really is: sellers may argue that the price they asks hardly leaves them any profit, while customers may play down how eager they are to have the article.
In heterodox economics, the economic surplus denotes the total income which the ruling class derives from its ownership of scarce factors of production, which is either reinvested or spent on consumption.