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In the menu, select assumptions/revenues/sales models. If the top of your screen does not read "Sales Model >> Customers by Marketing and Sales Effort," press the blue "Select a New Sales Model" button at the bottom of the screen and then select "BU 3: Use Marketing and Sales to Drive New Customer Acquisition." The eighth column of the screen contains the viral coefficient for each of the markets. Click on the values to change them. A viral coefficient of .5 means that half of your current customers refer a new customer.
Related Questions:
How do I change sales models?
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