Work at home: Understand the difference between a Pyramid scheme and work at home opportunities

There are so many people that have a huge misconception between work at home opportunities and Pyramid schemes.
Lets clear that up now.

A Pyramid scheme is when there is exchange of money without a real product or service in exchange for that money.  Example: Chain letters

Here is a Great article that will explain it in more detail: http://www.wikihow.com/Distinguish-Between-a-Pyramid-Scheme-and-Multi-Level-Marketing

I'd love to hear your comments on this topic.
Please comment below. I look forward to reading what you have to say!