Reputation is bucket five for a reason. It is the result of everything in the first four buckets, accumulated over time and interpreted by others. You cannot buy it, fake it for long, or build it in a hurry. You can only earn it, slowly, through consistent behaviour. But the compounding nature of reputation makes it one of the most powerful forces available to any ambitious person. A strong reputation opens doors without your having to knock. It produces referrals, opportunities, and partnerships that a lesser-known person with equivalent skills would never encounter. People take your calls. They trust your word. They advocate for you to others. Bartlett argues that most people dramatically underestimate the long-term value of a sterling reputation and dramatically underestimate the long-term cost of damaging it. He has watched founders lose the reputations they spent a decade building through a single act of dishonesty or a few months of bad behaviour under pressure. The lesson is practical. The decisions that feel low-stakes, whether to honour a commitment when nobody would notice if you did not, whether to be honest when a small deception would be convenient, whether to treat someone well who cannot help you, are often the most consequential ones for reputation. Reputation is built from the decisions you make when the stakes feel low. Those decisions accumulate into a picture that others carry of you long after any individual interaction has been forgotten.