需求的价格弹性（有时简称为价格弹性或需求弹性）衡量需求量对价格的响应性。需求价格弹性（PEoD）的公式为：PEoD =（需求数量变化百分比）/（价格变化百分比）（注意需求的价格弹性不同于需求曲线的斜率，即使斜率为在某种程度上，需求曲线还衡量需求对价格的响应性。）您可能会被问到“给定以下数据，当价格从9.00美元变为10.00美元时，计算需求的价格弹性”。使用页面底部的图表，我们将引导您回答这个问题。 （您的课程可能会使用更复杂的Arc Price Elasticity of Demand公式。如果是这样，您需要查看有关Arc Elasticity的文章）首先，我们需要找到我们需要的数据。我们知道原价是9美元，新价格是10美元，所以我们有价格（OLD）= 9美元和价格（新）= 10美元。从图表中我们可以看出，当价格为9美元时所需的数量为150，而当价格为10美元时为110.由于我们从9美元到10美元，我们有QDemand（OLD）= 150和QDemand（NEW）= 110，其中“QDemand”是“需求数量”的缩写。因此，我们有：为了计算价格弹性，我们需要知道数量需求的百分比变化是什么以及价格变化百分比是多少。最好一次计算这一个。计算所需数量的百分比变化。用于计算需求量百分比变化的公式是：当我们分析价格弹性时，我们关注它们的绝对值，所以我们忽略了负值。我们得出结论，当价格从9美元涨到10美元时，需求的价格弹性为2.4005。一位优秀的经济学家不仅对计算数字感兴趣。这个数字是达到目的的手段;在需求价格弹性的情况下，它用于了解对商品的需求对价格变化的敏感程度。价格弹性越高，消费者对价格变化的敏感度就越高。非常高的价格弹性表明，当商品的价格上涨时，消费者会少买很多商品，当商品的价格下降时，消费者会购买更多商品。极低的价格弹性意味着恰恰相反，价格的变化对需求几乎没有影响。
新西兰坎特伯雷大学经济学Assignment代写：需求价格弹性初探
Price elasticity of demand (sometimes referred to simply as price elasticity or elasticity of demand) measures the responsiveness of quantity demanded to a price. The formula for price elasticity of demand (PEoD) is: PEoD = (% Change in Quantity Demanded)/(% Change in Price) (Note that price elasticity of demand is different from the slope of the demand curve, even though the slope of the demand curve also measures the responsiveness of demand to price, in a way.) You may be asked the question “Given the following data, calculate the price elasticity of demand when the price changes from $9.00 to $10.00.” Using the chart on the bottom of the page, we’ll walk you through answering this question. (Your course may use the more complicated Arc Price Elasticity of Demand formula. If so, you’ll need to see the article on Arc Elasticity) First, we’ll need to find the data we need. We know that the original price is $9 and the new price is $10, so we have Price(OLD)=$9 and Price(NEW)=$10. From the chart, we see that the quantity demanded when the price is $9 is 150 and when the price is $10 is 110. Since we’re going from $9 to $10, we have QDemand(OLD)=150 and QDemand(NEW)=110, where “QDemand” is short for “Quantity Demanded.” Thus we have: To calculate the price elasticity, we need to know what the percentage change in quantity demand is and what the percentage change in price is. It’s best to calculate these one at a time. Calculating the Percentage Change in Quantity Demanded. The formula used to calculate the percentage change in quantity demanded is: When we analyze price elasticities we’re concerned with their absolute value, so we ignore the negative value. We conclude that the price elasticity of demand when the price increases from $9 to $10 are 2.4005. A good economist is not just interested in calculating numbers. The number is a means to an end; in the case of price elasticity of demand it is used to see how sensitive the demand for a good is to a price change. The higher the price elasticity, the more sensitive consumers are to price changes. A very high price elasticity suggests that when the price of a good goes up, consumers will buy a great deal less of it and when the price of that good goes down, consumers will buy a great deal more. A very low price elasticity implies just the opposite, that changes in price have little influence on demand.