In most cases they own shares in companies.
To get their net worth, look up the price on the stock market and multiply it by how many shares they have.
The result is a huge number.
Then add in the tiny amount in banks and such.
This is why you often hear “<Billionaire> lost X billion dollars in net worth when the stock market crashed”
It’s true, but when the stock recovers and they haven’t sold any of it, their net worth goes back up.
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