1. Introduction.- 2. Risk and Risk Perception: Why we are not Rational in the Face of Risk.- 3. Expected Utility, Prospect Theory, and the Allais Paradox: Why Reference Points are Important.- 4. Confirmation Bias and Anchoring Effect: Why the First Piece of Information is Key in Negotiations.- 5. Framing and the Ostrich effect: Why our Decisions depend on how Information is presented.- 6. Emotions and Zero Risk Bias: Why we make bad Decisions and overspend on Risk Avoidance.- 7. Endowment Effect and Status-Quo Bias: Why we Stick with Bad Decisions.- 8. Overconfidence and Self-Blindness: Why we think we are better than we actually are.- 9. The Low-Probability Puzzle: Why we insure our Cellphone but Not our Home.- 10. Fairness, Diversity, Groupthink, and Peer Effects: Why Other People matter for our Risky Decisions.- 11. Hindsight Bias: Why We Think we are Good Predictors even though we are not.