In business, a good rule of thumb is that 80 percent of your business comes from 20 percent of your customers—so take good care of them.
My rich dad took this rule a step further. He believed that, "Ninety percent of all money is earned by 10 percent of the people." He called it the 90-10 rule of money. For example, if you look at the game of golf, I would say that 10 percent of the golfers earn 90 percent of the money. In America today, approximately 90 percent of the wealth is owned by 10 percent of the people.
If you want to win the game of money, you cannot be average. You need to be in the top 10 percent.
— Robert Kiyosaki; Rich Dad's Conspiracy of The Rich