Robert G. Allen (also best-selling author of Nothing Down, Creating Wealth, and Challenge) writes in Multiple Streams of Income: How to Generate a Lifetime of Unlimited Wealth:
"Prosperous people practice seven financial secrets. I call them "secrets" not because very few of us are aware of them, but because very few of us use them. The secrets are, in reality, skills ... essential money skills that all wealthy people practice. I believe that if you learn these skills, wealth can flow into your life ... multiple streams of increasing prosperity. Wouldn't that be nice? Money to buy whatever you want ... houses, cars, travel, freedom. Surplus to share with the people you care most about. Security. Peace of mind. That's what these skills will bring you."
Allen also devotes a chapter to network marketing (or MLM = multilevel marketing), which he calls "the ultimate money machine."
