There are four basic investment categories. They are:
<ol>
<li>Businesses. The rich often own many businesses providing passive income, while an average person may have many jobs providing earned income.</li>
<li>Income-producing investment real estate. These are properties that provide passive income every month in the form of rent. Your home or your vacation home doesn't count, even if your financial planner tells you they're assets.</li>
<li>Paper assets—stocks, bonds, savings, annuities, insurance, and mutual funds. Most average investors have paper assets because they are easy to buy, require little management, and are liquid—meaning they are easy to get out of.</li>
<li>Commodities—gold, silver, oil, platinum, etc. Most average investors do not know how or where to buy commodities. In many cases, they don't even know how or where to buy physical gold or silver.</li>
</ol>
A sophisticated investor invests all four categories. That is true diversification. The average investor believes they are diversified, but most are only in category three, paper assets. That is not diversification.
— Robert Kiyosaki; Rich Dad's Conspiracy of The Rich