Postdecision regret, commonly known as buyer's remorse, occurs when individuals feel regret after making a choice, often questioning if they made the right decision. This psychological phenomenon reflects the anxiety associated with having options and the fear of making the wrong choice. It highlights the emotional burden that can come from the abundance of choices available to consumers.

In "The Paradox of Choice," Barry Schwartz discusses how excessive options can lead to dissatisfaction and regret, suggesting that a simpler approach to decision-making can improve overall happiness. The book emphasizes the idea that sometimes having fewer choices can prevent feelings of remorse and enhance contentment with the decisions we make.