A new study has found that people that are feeling down or gloomy are more likely to make big purchase decisions that they will later regret. These people are willing to pay up to 300 percent more for an item. Researchers say that sadness causes people to feel worthless and they often overspend as a way to feel better about themselves. The high that the person feels from overspending is short and they feel sorry about the purchase later, also known as buyer’s remorse. It is good advice not to go shopping while feeling down.