What is the real difference between Pyramid Scam and Network Marketing?

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We all have our own sources of income as long as you work hard for it. But there are also a lot of get rich quick schemes nowadays. Since my topic is about the difference between these two, how can we determine if what you have joined is just the pyramid scam or a network marketing company? What is the real power of network marketing? Are there testimonials that some people can get rich as long you set goals and work hard for it?