口红效应（Lipstick Effect）是指美国1930年经济大恐慌时期，人们消费能力有限，买不起高级消费品。消费者会转而购买价钱较低的产品，这时口红的销量反而会直在线升。

The lipstick effect is the theory that when facing an economic crisis consumers will be more willing to buy less costly luxury goods. Instead of buying expensive fur coats, for example, people will buy expensive lipstick.

It has been rumored that lipstick sales doubled after the 9/11 attacks on the United States; however, other sources say this is an overstatement. In a New York Times article published May 1, 2008, Leonard Lauder is quoted as saying that he noted his company's sales of lipstick rose after the terrorist attacks. He did not claim they doubled.