law of elastic demand

例句：

1. 1.The law of elastic demand states that as income increases, the demand for goods and services decreases.
   弹性需求法则指出，随着收入的增加，对商品和服务的需求会减少。
2. 2. This law of elastic demand explains why some products become more popular during economic downturns.
   这个弹性需求法则解释了为什么在经济衰退期间某些产品会变得更受欢迎。
3. 3. In this case, the law of elastic demand applies because consumers are willing to pay more for luxury goods when prices are high.
   在这个案例中，弹性需求法则适用，因为当价格高时，消费者愿意为奢侈品支付更多。