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In mainstream economics, economic surplus, also known as total welfare or Marshallian surplus (named after Alfred Marshall), refers to two related quantities. Consumer surplus or consumers' surplus is the monetary gain obtained by consumers because they are able to purchase a product for a price that is less than the highest price that they would be willing to pay. Producer surplus or producers' surplus is the amount that producers benefit by selling at a market price that is higher than the least that they would be willing to sell for; this is roughly equal to profit (since producers are not normally willing to sell at a loss, and are normally indifferent to selling at a breakeven price). In Marxian economics, the term ''surplus'' may also refer to surplus value, surplus product and surplus labour. == Overview == Economist Paul A. Baran introduced the concept of "economic surplus" to deal with novel complexities raised by the dominance of monopoly capital. With Paul Sweezy, Baran elaborated the importance of this innovation, its consistency with Marx's labor concept of value, and supplementary relation to Marx's category of surplus value.〔Baran, P.A. & Sweezy, P.M. (2012). ("Some Theoretical Implications" ). ''Monthly Review''. 64 (3).〕 On a standard supply and demand diagram, consumer surplus is the area (triangular if the supply and demand curves are linear) above the equilibrium price of the good and below the demand curve. This reflects the fact that consumers would have been willing to buy a single unit of the good at a price higher than the equilibrium price, a second unit at a price below that but still above the equilibrium price, etc., yet they in fact pay just the equilibrium price for each unit they buy. Likewise, in the supply-demand diagram, producer surplus is the area below the equilibrium price but above the supply curve. This reflects the fact that producers would have been willing to supply the first unit at a price lower than the equilibrium price, the second unit at a price above that but still below the equilibrium price, etc., yet they in fact receive the equilibrium price for all the units they sell. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Economic surplus」の詳細全文を読む スポンサード リンク
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