There are wise sayings:

1 - The richest man is not he who has the most, but he who needs the least.

2 - The easiest way to get rich is to demand less.

When you demand less you will feel that you do not need much. When you do not need anything then you must be rich. This is truth, either literally or figuratively.

Figuratively speaking, then you demand less you will feel like a rich person - who is not in dire need of anything. As mentioned in the scripture, Peta, the hungry ghost, is always hungry and thirsty. It always wants to eat because it is always hungry. It always wants to drink because it is always thirsty. If we humans do not practice the righteous path we will be worst than the hungry ghost because, beyond hunger for food and thirst for drinks, we also have many other cravings. Therefore, the first thing happens when we reduce our needs is we cease to crave. We will then cease to rely too much on things in life, or in the world. Once we stop needing this or that, we will live with the feeling of a rich person.

Speaking literally, when you need less you will save quite a bit of time and energy, not just money.

When you buy a thing you don't need you lose the money for the things you really need.

If you keep buy things you don't need, one day you'll have to sell something you really need.