1. Discuss the psychological or social reasons why people might purchase unnecessary items, such as impulse buying, social pressure, or advertising influence. 2. You can also mention personal experiences or observations related to this behavior.

1. 讨论人们购买不必要物品的心理或社会原因，比如冲动购买、社会压力或广告影响。 2. 你也可以提及与这种行为相关的个人经历或观察。