The document summarizes and discusses several studies related to human behavior and decision making:
1. A study found that people go to great lengths to justify indulgent decisions like eating chocolate, providing many reasons to give themselves "permission" to indulge rather than seeing it as an impulse.
2. Nostalgia can increase spending by making people feel more socially connected and less needing of money.
3. Happiness fuels success more than the other way around, as positive emotions lead to cognitive advantages that increase productivity, intelligence and problem solving.
4. Materialism is negatively correlated with well-being, impacting health, relationships and self-esteem, though some careers and cultures mitigate this effect.