MLM does not work for 99% of participants because MLM is mathematically designed so only the top 1% of participants even make a profit. Work it out on paper. Keep in mind, because the commissions paid out are so high (to the top 1%), the price of the product involved has to be so expensive that it becomes impossible to resell as a distributor. MLMs require you to purchase the product in order to be "eligible" for commission. This is known as "Pay to Play". Because you cannot resell the product, it piles up. This is known as "Inventory Loading".
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Network Marketing|MLM Marketing