為什麼聰明人的錢越花越多，你的花錢方式決定了你能賺多少錢 | 馬克吐溫（10個越花越多的花錢習慣）

One scholar put forward the concept of a "money spiral",
He believes that investing money in his greatest interests,
Sharpen your skills, experience, and enhance your ability to make money.
This creates a "money-interest-work-money" spiral.
The "money spiral" not only allows the money spent to flow back on its own, but also makes it easier to achieve a balance between money and happiness.
No matter how much money a person has, he must have thought:
If only there was more money...
What is "more"? Lacking metrics, it is difficult to be happy with no amount of money.

The best state of life is the balance between money and happiness.