# 英国诺丁汉大学经济学Essay代写：价格弹性

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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.)