I read it and took away a different message: The rich make their money work for them by investing. The poor work for their money and spend it on shit, so they have nothing left.

The takeaway then, is to stop buying shit that you don't need, and invest the money you have in something that grows, like a reasonably safe investment trust.

Invest when the market has just crashed, and then sit tight for 5-10 years. I can testify that this works. But I still work to earn money too.