Although we usually have the freedom to make a wide range of choices at any given moment, we often make decisions based on the environment we find ourselves in:
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Default choices are not inherently bad, but the entire world was not designed with your goals in mind. In fact, many companies have goals that directly compete with yours (a food company may want you to buy their bag of chips, while you want to lose weight). For this reason, you should be wary of accepting every default as if it is supposed to be the optimal choice. - James Clear
Example: If you’re a writer, your goal is to write a book. Your system is the writing schedule that you follow each week.