People often buy things they don't need because of advertisements. Ads make everything look so good and necessary, so people end up buying them even if they don't really need them.

Social pressure makes people buy unnecessary things. When they see their friends or famous people with the latest gadgets or fashion, they feel like they need to buy them too, just to fit in.

Sometimes, when people are sad or stressed, they go shopping. Buying new stuff can make them feel happier for a little while, even if they don't really need what they buy.

People sometimes buy things they don't need because they didn't plan their shopping. If they go shopping without a list or a budget, they might end up buying things on impulse.