Luke, thanks for reading and leaving a comment. Sure, royalty income is another one. Most people would get that through creating something, so more of an investment of time than money, but you can invest in oil and gas royalties that generate cash flow, so absolutely. Leverage is powerful and dangerous. Kiyosaki compares it to a loaded gun, which is a good way of thinking about it. I have “a lot” of debt because I have real estate. It is critical to not take out too much debt per property, ensure the properties have positive cash flow, and have cash reserves in case something happens. If you can use debt prudently, it can help you build more wealth faster. But get carried away (100% financing, etc), and you can lose it all.