习惯的复利效应：微小选择会沿时间放大

早睡半小时、读几页书、多吃一次零食，单独看一天都不大像会改变什么。麻烦和希望都藏在重复里。同一个选择沿着一个方向做久了，起初看不出的差异才会慢慢拉开。

坏习惯因此很容易被原谅。一次小差错没有明显后果，下一次便更容易照旧；等问题终于出现，里面已经叠着许多次微小退让。好习惯的难处刚好相反，代价先付，结果迟迟不到，很多人会在 积累还没有显形 时停下来。

书里用每天改善百分之一、年末变成 37.78 倍来制造直觉。现实中的能力、健康和关系当然不会按固定比例整齐增长，这个数字也不适合拿来预测人生。它真正说清的是方向与时间的合力。一个人就是他所有习惯的集合，正是那些当时看起来无足轻重的动作，在多年以后留下的总和。

《Atomic Habits》原文：

Meanwhile, improving by 1 percent isn’t particularly notable—sometimes it isn’t even noticeable—but it can be far more meaningful, especially in the long run. The difference a tiny improvement can make over time is astounding. Here’s how the math works out: if you can get 1 percent better each day for one year, you’ll end up thirty-seven times better by the time you’re done. Conversely, if you get 1 percent worse each day for one year, you’ll decline nearly down to zero. What starts as a small win or a minor setback accumulates into something much more. 1% BETTER EVERY DAY 1% worse every day for one year. 0.99365 = 00.03 1% better every day for one year. 1.01365 = 37.78 (Location 241)

Unfortunately, the slow pace of transformation also makes it easy to let a bad habit slide. (Location 258)

But when we repeat 1 percent errors, day after day, by replicating poor decisions, duplicating tiny mistakes, and rationalizing little excuses, our small choices compound into toxic results. It’s the accumulation of many missteps—a 1 percent decline here and there—that eventually leads to a problem. (Location 261)

If you want to predict where you’ll end up in life, all you have to do is follow the curve of tiny gains or tiny losses, and see how your daily choices will compound ten or twenty years down the line (Location 276)

Positive Compounding Productivity compounds. Accomplishing one extra task is a small feat on any given day, but it counts for a lot over an entire career. The effect of automating an old task or mastering a new skill can be even greater. The more tasks you can handle without thinking, the more your brain is free to focus on other areas. Knowledge compounds. Learning one new idea won’t make you a genius, but a commitment to lifelong learning can be transformative. Furthermore, each book you read not only teaches you something new but also opens up different ways of thinking about old ideas. As Warren Buffett says, “That’s how knowledge works. It builds up, like compound interest.” Relationships compound. People reflect your behavior back to you. The more you help others, the more others want to help you. Being a little bit nicer in each interaction can result in a network of broad and strong connections over time (Location 285)

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