For years, companies have pursued growth through ever more sophisticated customer acquisition tactics, such as digital advertising, influencers, social media campaigns, search engine optimization (SEO) and lead generation platforms. Yet despite all this investment, customer referrals, one of the most powerful drivers of sustainable growth, remains surprisingly underutilised.
Although most leaders recognise that word of mouth matters, the issue is that few organisations measure referrals systematically, understand their true economic impact, or intentionally build their commercial strategy around them. During my twenty years in Sales, I have often observed that the easiest Sales opportunities came not from the most sophisticated campaigns, but from satisfied customers introducing us to new prospects.
A recent analysis from the global management consulting firm Bain & Company of the data provided from the referral marketing platform Mention Me of more than 10 million people who participated in referral programs, suggests that this may be a costly mistake. Across a range of industries, they found that on average, while referred customers represented only about 20% of new customer acquisitions, they generated more than 70% of new-customer profits. This means that just a relatively small group of customers is responsible for a disproportionally large share of profitability.
Many organisations use Net Promoter Score (NPS) to measure customer loyalty, which categorises customers into three groups. Promoters (score 9-10) that are loyal advocates who actively recommend a business. Passives (score 7-8) who are satisfied customers that could easily switch to competitors and Detractors (score 0-6) characterised as unhappy customers who may damage a company’s reputation through negative word of mouth. For more than twenty years, since it was firstly introduced by Fred Reiccheld, NPS has helped organisations to focus on customer experience rather than simple transactions, as it shifted attention from short-term sales figures to long-term customer relationships. This certainly makes sense, because when customers genuinely value the experience provided, they buy again, spend more, and even become ambassadors of a brand.
However, NPS’s main weakness is that it essentially measures sentiment, not business outcomes, since not everyone saying that they would recommend a company actually does, so the research introduces the concept of True Promoters. These clients are a much smaller group that consistently influences purchasing decisions among friends, family members, colleagues, and professional networks, hence creating real commercial value. The question that now arises is, how the contribution of the True Promoters can be tracked down and this is where the notion of Earned Growth enters the conversation.
Earned Growth was introduced in 2021 from Reichheld, Darnell and Burns in their Harvard Business Review article “Net Promoter 3.0”, as a more objective complement to NPS, measuring the percentage of company’s growth that comes from returning customers and from new customers acquired through referrals and recommendations from existing clients, capturing the growth earned through customer loyalty and advocacy. This metric can be calculated from the combination of the revenue retained and expanded from existing clientele and the revenue from customers that joined due to referrals, compared to the total revenue.
In my view, one of the most important implications of the above is the redefinition of the role of Sales, as success is often defined by the number of new accounts opened, pipeline generated, or market share gained. Yet Earned Growth suggests that the most effective Sales strategy may not be acquiring more customers at any cost, but it may be creating experiences so valuable that existing customers would willingly generate growth on the company's behalf.
Businesses should shift their attention to earning the loyalty and advocacy of the acquired customers, through consistently delivering Value. Sales should not end when the contract is signed. The real opportunity begins afterwards, when customers start realising Value, building trust, and becoming advocates. Every successful implementation, every problem solved, and every promise delivered increases the likelihood that a customer will return and recommend.
Finally, with regards to NPS, it remains a valuable KPI that tells us how customers feel, but it should be combined with Earned Growth that shows whether these feelings are translated into measurable business results, so it is not a case of choosing between them but using them both. In an era where customer acquisition costs continue to rise, perhaps the smartest growth strategy is not finding more customers but creating more advocates.