At the beginning of this chapter we talked about how money has evolved from barter to digital money—money at the speed of light. Today, one reason why we have people making billions and others still working for $7 an hour is caused by a differential in speed. Today, the faster a person can transact business, the more money he or she will make. For example, a typical medical doctor can see one patient at a time. A high school kid with a global Web business, transacting business to unlimited customers 24/7, can potentially earn much, much more than a medical doctor. The difference, as I will talk about in the next chapter is that one type of work is metaphysical (Web business) and the other is physical (medical doctor). One type of work creates wealth exponentially; the other creates wealth linearly.
— Robert Kiyosaki; Rich Dad's Conspiracy of The Rich
