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Reference.org
Matrix scheme
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<p> A matrix scheme (also known as a matrix sale or site, and as a hellevator, excavator or ladder scheme) is a <a href="/facts/Business_model/TL9XXsQa">business model</a> involving the exchange of money for a certain product with a side bonus of being added to a waiting list for a product of greater value than the amount given. Matrix schemes are also sometimes considered similar to <a href="/facts/Ponzi_scheme/TBqYoVxV">Ponzi</a> or <a href="/facts/Pyramid_scheme/eQQHuodc">pyramid</a> schemes. They have been called "unsustainable" by the United Kingdom's <a href="/facts/Office_of_Fair_Trading/nGMQ6IRD">Office of Fair Trading</a>. A matrix scheme is also an example of an 'exploding queue' in <a href="/facts/Queueing_theory/8NDl56EM">queueing theory</a>. </p>