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In economics, the law of demand states that, all else being equal, as the price of a product increases (↑), quantity demanded falls (↓); likewise, as the price of a product decreases (↓), quantity demanded increases (↑). In simple terms, the law of demand describes an inverse relationship, and an elasticity, between price and quantity of demand. There is a negative relationship between the quantity demanded of a good and its price. The factors held constant in this relationship are the prices of other goods and the consumer's income.〔''http://www.investopedia.com/terms/l/lawofdemand.asp''; Investopedia, Retrieved 9 September 2013〕 There are, however, some possible exceptions to the law of demand (see Giffen goods and Veblen goods). == Mathematical expression == Mathematically, the inverse relationship may be expressed as a causal relation: : where is the quantity demanded of good ''x'', is the price of the good, is the demand function, and is its derivative. Here, is the causal factor (independent variable) and Is the dependent variable. 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「law of demand」の詳細全文を読む スポンサード リンク
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