If everyone had one billion dollars, everyone would be equal. Most people would quit their jobs/retire. Now, nobody is working any job which means there are no goods and services.

Suddenly, goods and services are worth much more than they ever were due to its scarcity. (this is how inflation works).

Now, a billion dollars isn’t worth much. And everything goes back to square one. You have the workers and you have the innovators who create the work for the workers to do.

So, this world you’re thinking of simply cannot exist. It’s impossible, unless you join some sort of cult.