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complementary good : ウィキペディア英語版
complementary good

In economics, a complementary good or complement is a good with a negative cross elasticity of demand, in contrast to a substitute good. This means a good's demand is increased when the price of another good is decreased. Conversely, the demand for a good is decreased when the price of another good is increased. If goods A and B are complements, an increase in the price of A will result in a leftward movement along the demand curve of A and cause the demand curve for B to shift in; less of each good will be demanded.
A decrease in price of A will result in a rightward movement along the demand curve of A and cause the demand curve B to shift outward; more of each good will be demanded. Basically this means that since the demand of one good is linked to the demand of another good, if a higher quantity is demanded of one good, a higher quantity will also be demanded of the other, and if a lower quantity is demanded of one good, a lower quantity will be demanded of the other. The prices of complementary goods are related in the same way: if the price of one good rises, so will the price of the other, and vice versa. With substitute goods, however, the price and quantity demanded of one good is related inversely to the price and quantity demanded of a substitute good, meaning that if the price or quantity demanded of one good rises, the price or quantity demanded of its substitute will fall.
When two goods are complements, they experience joint demand. For example, the demand for razor blades may depend upon the number of razors in use; this is why razors have sometimes been sold as loss leaders, to increase demand for the associated blades. 〔(Future Observatory )〕
==Examples==

An example of this would be the demand for hot dogs and hot dog buns. The supply and demand of hot dogs is represented by the figure at the right with the initial demand D1. Suppose that the initial price of hot dogs is represented by P1 with a quantity demanded of Q1. If the price of hot dog buns were to decrease by some amount, this would result in a higher quantity of hot dogs demanded. This higher quantity demanded would cause the demand curve to shift outward to a new position D2. Assuming a constant supply curve S of hot dogs, the new quantity demanded will be at D2 with a new price P2.
Other examples include:
*Printers and ink cartridges
*DVD players and DVDs
*Computer hardware and computer software
*Boots and laces
*Flashlight and battery
*Tea and sugar
*Mobile Phones and Sim Cards

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「complementary good」の詳細全文を読む



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