顾名思义，需求的价格弹性衡量商品或服务所需数量对商品或服务价格的响应程度。我们可以考虑个人需求的价格弹性（需要对价格的个体数量的响应性）或市场水平（需要对价格的市场数量的响应性）。在数学上，需求的价格弹性等于商品或服务所需数量的百分比变化除以产生需求量变化的商品或服务价格的变化百分比。 （请注意，正确的价格弹性计算将包含除价格常数变化以外的所有因素。）与其他弹性一样，我们可以使用此公式计算点弹性，或者我们可以使用中点公式计算价格弹性的弧弹性版本需求。由于需求定律意味着需求曲线几乎总是向下倾斜（除非Giffen商品当然是好的），需求的价格弹性几乎完全是负的。有时，作为惯例，需求的价格弹性被报告为绝对值（即正数），并且仅仅暗示负号。与其他弹性一样，需求的价格弹性可以归类为完全弹性或完全无弹性。如果需求的价格弹性完全没有弹性，那么当商品的价格发生变化时，商品的需求量就不会发生变化。 （例如，人们希望必要的药物可以作为这类药物的例子。）与其他弹性一样，在这种情况下完全无弹性对应于需求的价格弹性等于零。如果需求的价格弹性是完全弹性的，那么即使是商品价格中最微小的变化，商品所需的数量也会基本上无限变化。在这种情况下，完全弹性对应于正或负无穷大的需求的价格弹性，这取决于是否遵循将需求的价格弹性作为绝对值报告的惯例。
澳大利亚悉尼大学论文代写：市场水平
As the name implies, the price elasticity of demand measures the degree to which a quantity of goods or services is responsive to the price of a good or service. We can consider the price elasticity of individual demand (requires responsiveness to the individual quantity of the price) or the market level (requires responsiveness to the market quantity of the price). Mathematically, the price elasticity of demand is equal to the percentage change in the quantity required for a good or service divided by the percentage change in the price of a good or service that produces a change in demand. (Note that the correct price elasticity calculation will include all factors except the price constant change.) Like other elasticity, we can use this formula to calculate point elasticity, or we can use the midpoint formula to calculate the price elasticity of the arc elastic version. . Since the demand law means that the demand curve is almost always tilted downwards (unless Giffen goods are of course good), the price elasticity of demand is almost completely negative. Sometimes, as a rule, the price elasticity of demand is reported as an absolute value (ie, a positive number) and only implies a negative sign. Like other resilience, the price elasticity of demand can be classified as either fully elastic or completely inelastic. If the price elasticity of demand is completely inelastic, then when the price of the commodity changes, the demand for the commodity will not change. (For example, people want the necessary drugs to be an example of such drugs.) Like other elasticity, in this case, the total inelasticity corresponds to the price elasticity of demand equal to zero. If the price elasticity of demand is completely elastic, then even the slightest change in the price of the commodity, the quantity required for the commodity will change substantially indefinitely. In this case, full elasticity corresponds to the price elasticity of the demand of positive or negative infinity, depending on whether or not the convention of reporting the price elasticity of demand as an absolute value is followed.