To make money they didn’t have and didn’t need, they risked what they did have and did need. And that’s foolish. It is just plain foolish. If you risk something that is important to you for something that is unimportant to you, it just does not make any sense.

The End of History Illusion is what psychologists call the tendency for people to be keenly aware of how much they’ve changed in the past, but to underestimate how much their personalities, desires, and goals are likely to change in the future.

The customer is always right” and “customers don’t know what they want” are both accepted business wisdom. The line between “inspiringly bold” and “foolishly reckless” can be a millimeter thick and only visible with hindsight.

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You might think you want an expensive car, a fancy watch, and a huge house. But I’m telling you, you don’t. What you want is respect and admiration from other people, and you think having expensive stuff will bring it. It almost never does — especially from the people you want to respect and admire you.

If you understand the math behind compounding you realize the most important question is not “How can I earn the highest returns?” It’s “What are the best returns I can sustain for the longest period of time?” Little changes compounded for a long time create extraordinary changes. Same as ever.

Being swayed by people playing a different game can also throw off how you think you’re supposed to spend your money. So much consumer spending, particularly in developed countries, is socially driven: subtly influenced by people you admire, and done because you subtly want people to admire you. But while we can see how much money other people spend on cars, homes, clothes, and vacations, we don’t get to see their goals, worries, and aspirations. A young lawyer aiming to be a partner at a prestigious law firm might need to maintain an appearance that I, a writer who can work in sweatpants, have no need for. But when his purchases set my own expectations, I’m wandering down a path of potential disappointment because I’m spending the money without the career boost he’s getting. We might not even have different styles. We’re just playing a different game. It took me years to figure this out. A takeaway here is that few things matter more with money than understanding your own time horizon and not being persuaded by the actions and behaviors of people playing different games than you are.

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A good rule of thumb for a lot of things in life is that everything that can break will eventually break. So if many things rely on one thing working, and that thing breaks, you are counting the days to catastrophe. That’s a single point of failure.