In early summer of 2005, I sent a warning to the Rich Dad community that the real estate market was cooling down. After all, we know that all booms go bust eventually, and every party comes to an end.

A great quote from Warren Buffett goes: "I'm a better investor because I'm a businessman, and I'm a better businessman because I'm a better investor." So let me tell you how to be a better investor by being better at business. Business knowledge varies among these three kinds of people:

Legendary business icons Donald Trump and Robert Kiyosaki share their inside secrets for building entrepreneurial wealth.

In October 2005, I was in New York City, speaking on the business of real estate and real estate investing. One of the other keynote speakers was Donald Trump. After my talk, a young man came up to me and said, "Nice talk, but you can't do what you talk about here in New York City."

Many of Wall Street's elite firms were being required to pay tens of millions of dollars in fines to investors, according to media reports. The penalties are for alleged bad investment advice, courtesy of New York State Attorney General Eliot Spitzer.