How to Calculate Earned Growth Ratio

New York Times bestselling author Fred Reichheld explains why brands should keep track of referrals and the number of new clients they gain from the recommendations of current customers.
That's the best way to tell where your true growth comes from.
The only industry that does that well is Software as a Service (SaaS) companies.
Fred says companies undervalue the power of referrals because they don't know how to measure them.