The two key factors that drive viral growth are the viral coefficient and the viral cycle time. The viral coefficient, or K, is the number of additional customers you can get for each customer you bring in. The viral coefficient formula is: K = i * conversion percentage where K is the viral coefficient, i is the number of invites sent per user, and conversion percentage is the percentage of customers who sign up after receiving an invitation. For example, if your customers send out an average of three invites and two of those people usually convert to new customers, your viral coefficient
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