It’s very difficult to get rich giving up your time for money. Because you only have a certain amount of time - it’s finite.
The idea here is to make your time more valuable - having a skill, etc.
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The only problem with making time more valuable in this sense is
that your time is still finite - there is a cap in your earnings potential - no matter how skilled you are.
For example,
doctors earn more, but still trade their time - so there is a cap in earnings.