My Life as a 20ish Single

Opportunity cost is a common term in Economics. In definition, it means:

The cost of an alternative that must be forgone in order to pursue a certain action.

Investopedia provides economics dummies like myself an example that illustrates the concept very well.

If a gardener decides to grow carrots, his or her opportunity cost is the alternative crop that might have been grown instead (potatoes, tomatoes, pumpkins, etc.).

What else? I love the way Liu Yong (famous writer) put it.

我们都只有一生，选了这个，很可能就永远失去了那个. 如同我的学生所说，他假使选择美术系，今天可能不是成功的大老板，而是伟大的画家.

所以，你永远在选了梨之后，都可以猜如果挑苹果，会更好。也可以在大家都赞美苹果的时候，毫无遗憾地说:“我仍然相信我的选择最正确。”

别问我，问你自己！如果你还不能独立、不能坚持、不能无悔，就最好别擅自‘坚持’做你可能‘后悔’的事。相反的，如果你认为符合做主的条件，坚信自己能成为另一个比尔·盖茨，谁又能阻拦你呢？”

I have a choice to make. A choice between working as a well-paid professional, or to pursue a new journey in telecommunications. There is no way to do both. I can only hope that I don't live to regret my final call.