Just as we are more likely to repeat an experience when the ending is satisfying, we are also more likely to avoid an experience when the ending is painful. Pain is an effective teacher. If a failure is painful, it gets fixed. If a failure is relatively painless, it gets ignored. The more immediate and more costly a mistake is, the faster you will learn from it. The threat of a bad review forces a plumber to be good at his job. The possibility of a customer never returning makes restaurants create good food. The cost of cutting the wrong blood vessel makes a surgeon master human anatomy and
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