"In my world, real assets fall into several different categories: 1. Businesses that do not require my presence. I own them, but they are managed or run by other people. If I have to work there, it's not a business. It becomes my job. 2. Stocks. 3. Bonds. 4. Mutual funds. 5. Income-generating real estate. 6. Notes (lOUs). 7. Royalties from intellectual property such as music, scripts, patents. 8. And anything else that has value, produces income or appreciates and has a ready market."
-Rich Dad, Poor Dad (Robert Kiyosaki)