What is wealth? It’s having plenty, right? The variables in the equation are pretty simple. What you have, what you’ve got coming in, and what’s going out. If those are in proper proportion to each other, you’re covered. Except what we tend to miss in this equation is another set of hidden variables that most often take the shape of our relative needs and wants.

Most people accumulate their wealth by earning as much as they can. That’s why they work so hard. Why they take so many risks. Why they invest. But the reason they do this is not to be covered -- it’s because they have told themselves that what they need is more, more, more, and that what they have already is not enough.
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What Is Wealth? — by Ryan Holiday