弹性度量均遵循相同的基本原理，无论要测量哪些变量。在随后的讨论中，我们将以需求的价格弹性为代表。需求价格弹性计算为需求数量相对变化与价格相对变化之比。从数学上讲，需求的价格弹性就是需求量的百分比变化除以价格的百分比变化：这样，需求的价格弹性就回答了一个问题：“一个人的需求量变化是多少？价格上涨百分之几？”注意，由于需求的价格和数量趋向于相反的方向，因此需求的价格弹性通常最终为负数。为简化起见，经济学家通常将需求的价格弹性表示为绝对值。 （换句话说，需求的价格弹性可以用弹性数的正数来表示，例如3而不是-3。）
英国诺丁汉大学经济学Essay代写：价格弹性
The elastic metrics follow the same basic principle, no matter which variables are measured. In the ensuing discussion, we will be represented by the price elasticity of demand. The demand price elasticity is calculated as the ratio of the relative change in demand quantity to the relative change in price. Mathematically, the price elasticity of demand is the percentage change in demand divided by the percentage change in price: thus, the price elasticity of demand answers a question: “What is the change in demand for one person? “Note that since the price and quantity of demand tend to be in the opposite direction, the price elasticity of demand is usually ultimately negative. For the sake of simplicity, economists often express the price elasticity of demand as an absolute value. (In other words, the price elasticity of demand can be expressed as a positive number of elasticity numbers, such as 3 instead of -3.)
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