Earned Growth Rate

Earned Growth Rate (EGR) is an accounting-based business metric introduced by Fred Reichheld, Darci Darnell, and Maureen Burns of Bain & Company in the November–December 2021 issue of Harvard Business Review ("Net Promoter 3.0") and expanded in the book Winning on Purpose (December 2021). It measures what proportion of a company's revenue growth is "earned" — generated by returning customers and their referrals — as opposed to "bought" through paid advertising, promotions, or persuasive salespeople. "Earned Growth" is a registered service mark of Bain & Company, Inc.

Definition and Purpose

Reichheld developed EGR to address two problems with Net Promoter Score (NPS): gaming (employees manipulating survey results) and the gap between survey intent and financial behaviour. NPS asks how likely customers are to recommend; EGR measures whether they actually did recommend, and whether those recommendations converted into paying customers. The two are designed as complements: NPS captures customer intent, EGR captures the accounting outcome of that loyalty (Bain, bain.com, 2021-10-18; Medallia, youtube.com, 2023-12-18).

The core distinction is between two types of growth:

• Earned growth — revenue from customers who returned voluntarily and from customers who came via peer recommendations
• Bought growth — revenue from new customers acquired via advertising, search engines, promotional deals, or persuasion

Two companies growing at the same reported rate (e.g. 30%) can have materially different business quality profiles depending on how much of that growth is earned vs bought, with earned-growth companies holding a sustained economic performance advantage (Maureen Burns, Bain partner, via CustomerGauge, customergauge.com, 2026-07-10).

EGR was designed to be "based on audited revenues from all customers, not just on a potentially biased sample of survey responses, so that it would be far more resistant to gaming, coaching, pleading, and the response biases that plague the results of non-anonymized surveys" (Reichheld/Bain, bain.com, 2021-10-18).

Formula

EGR = NRR + ENC − 100%

Where:

• NRR (Net Revenue Retention) — the percentage of this year's revenue that came from customers who were also customers in the prior year (repeat and expanded purchases)
• ENC (Earned New Customers) — the percentage of new-customer revenue that came from referrals / organic word-of-mouth rather than paid acquisition

An illustrative calculation: a company with NRR of 75% and ENC of 45% produces EGR = 20%. A second company with NRR of 30% and ENC of 85% produces EGR of 15%, showing that strong referral-driven acquisition can partially offset weaker retention (Mercury, mercury.com, 2024-07-27, updated 2026-07-28).

Reichheld states "superstar companies" can achieve EGR of 130%, 140%, or 150%, where nearly all growth is driven by customer advocacy rather than paid acquisition (Reichheld via Mention Me, youtube.com, 2024-04-26). At some high-performing companies, Bain research found as much as 90% of new customer flow comes from recommendations and referrals (Reichheld via Medallia, youtube.com, 2023-12-18).

Classifying customers as earned vs. bought

The ENC component requires a customer origin survey — typically shown to a small proportion of first-time buyers post-purchase — asking how they discovered the brand. Responses indicating referral, reputation, reviews, or previous personal use are classified "earned"; responses indicating advertising, search engines, promotions, or a salesperson are classified "bought" (Mention Me, docs.mention-me.com, undated).

[!note] Forrester flagged a methodological weakness: customers decide subconsciously and may underestimate the influence of advertising while overestimating the influence of recommendations, making origin surveys potentially unreliable signals of true acquisition channel. "Customers decide subconsciously, aren't always aware why they make decisions, and like to think they made rational decisions rather than reacting to an ad." (Forrester, forrester.com, date unknown.)

Relationship to Net Promoter Score (NPS)

Reichheld consistently frames EGR as a complement to Net Promoter Score (NPS), not a replacement: "Earned Growth Rate is a completely separate metric used to reinforce NPS. And the two together are so much more powerful" (Reichheld via Medallia, youtube.com, 2023-12-18).

The intended system:

1. NPS identifies promoters (likely to refer) and detractors (likely to churn or damage reputation)
2. EGR validates whether NPS promoters are actually generating referrals and repeat revenue
3. Together, they connect customer sentiment to financial outcomes

Reichheld argues NPS is misused when companies chase a score rather than earning growth through referrals: "When NPS tools focus on pure accountability, love is removed from the equation" (Bain/NPS System, netpromotersystem.com, 2022-10-13). On the Gainsight video series, Reichheld reframed EGR as shifting from survey-based measurement to behaviour-based measurement: "Instead of measuring surveys, just measure your customers and how many of them are expanding their purchases and how many are referring" (Reichheld via Gainsight, youtube.com, date unknown ~2023).

A 2025 TELUS Digital/Statista survey found only 23% of enterprise CX leaders still use NPS as a performance metric — signalling appetite for alternatives or complements such as EGR (cited via Referral Rock, referralrock.com, as-of 2024-09-12).

Ecommerce and Retail Applicability

Underlying dynamics EGR seeks to capture

Gorgias data from 12,000+ merchants illustrates the earned-growth dynamic in ecommerce: repeat customers represent only 21% of customers but generate 44% of revenue and 46% of orders (Gorgias via Opensend, opensend.com, as-of 2026-05-27).

Industry-average repeat purchase rates (as-of 2026-05-27, via Opensend):

Sector	Repeat Purchase Rate
All ecommerce	25–30%
Fashion/apparel	25–26%
Groceries	~65%
Luxury goods	~9.9%

[!volatile] Repeat purchase rate benchmarks are as-of 2026-05-27 (Opensend citing Gorgias 12,000+ merchant dataset and multiple industry sources; primary sources for sub-sector rates not all individually named).

Genuine (non-incentivised) referrals bring in higher-quality customers than average, with referred-customer Customer Lifetime Value (CLV) "almost always significantly greater than the average" (Bain/NPS System, netpromotersystem.com, 2023-07-20).

Implementation challenges for retail

Forrester explicitly identifies ecommerce and retail as sectors where EGR is hardest to implement, for three reasons (Forrester, forrester.com, date unknown):

1. Non-subscription model: NRR calculations are designed for recurring-revenue models (SaaS, subscriptions). Retail's transaction-by-transaction model makes it harder to determine whether a customer is "still with the firm" and therefore whether repeat revenue should count as retained.

2. Data infrastructure: EGR requires Customer-Based Accounting — tracking revenues and costs per customer over time — which Forrester calls "the nirvana for CX pros trying to prove ROI" but also a significant data challenge for retailers without mature CRM and analytics stacks.

3. Survey bias: Classifying new customers as earned or bought via post-purchase surveys is prone to customer reporting bias (see Formula section above).

B2B / complex-purchase complexity

Forrester noted additional complexity for B2B ecommerce: buyers go through an average of 27+ interactions before purchase (mix of earned and bought touchpoints), and a customer initially acquired via paid channels may generate earned upsell revenue later, making the earned/bought binary difficult to maintain cleanly.

Regulatory aspiration

Reichheld and co-authors explicitly called on regulators to make EGR a "formal GAAP metric with precise reporting rules" in the 2021 HBR article (Bain, bain.com, 2021-10-18). As of 2026-08-05, no evidence of regulatory progress on this call has been found.

Vendor Implementations and Tools

• CustomerGauge claimed to be the first Voice of Customer (VoC) platform with native EGR tracking built in, launched at their Monetize! conference (CustomerGauge, customergauge.com, as-of 2023-07-10).
• Mention Me requires: 2+ years of continuous historical order data; 1,000+ customer origin survey responses; and a post-purchase survey integrated into the checkout or confirmation page. It models earned customers as 50% more likely to refer, spending 20% more, and 20% more likely to be retained than bought customers (Mention Me, docs.mention-me.com, undated). These multipliers are Mention Me's proprietary model assumptions; no named primary source was cited.
• Fred Reichheld joined Mention Me as an advisor in January 2023, framed around building EGR into the platform's referral analytics: "With Mention Me, we finally have a technology platform that lets us measure, manage, and understand the economics of the real goal — earning referrals" (Mention Me, youtube.com, 2024-04-26).

Andy Cockburn (CEO, Mention Me) introduced the concept of "extended lifetime value" — CLV extended by the value of the customers a customer refers — as the next measurement frontier for quantifying referral economics (Bain/NPS System, netpromotersystem.com, 2023-07-20).

Key Terms

Term	Meaning
Earned Growth Rate (EGR)	NRR + ENC − 100%; measures revenue growth from loyalty and referral behaviours
Net Revenue Retention (NRR)	% of this year's revenue from customers who were also customers last year
Earned New Customers (ENC)	% of new-customer revenue sourced from referrals/recommendations
Bought Growth	Revenue from customers acquired via paid channels (ads, promotions, persuasion)
Customer-Based Accounting	Tracking per-customer revenues and costs over time — prerequisite for EGR
Extended Lifetime Value	CLV extended by the value of customers a customer refers (Mention Me/Bain framing)

Benchmarks (as-of dates vary; see per-row notes)

Benchmark	Value	Source	As-of
EGR ceiling ("superstar companies")	130–150%	Reichheld via Mention Me youtube	2024-04-26
Referral flow at top performers	~90% of new customers	Reichheld via Medallia youtube	2023-12-18
Repeat customers as % of customers	21%	Gorgias/Opensend opensend.com	2026-05-27
Repeat customers as % of revenue	44%	Gorgias/Opensend	2026-05-27
Fashion/apparel repeat purchase rate	25–26%	Opensend	2026-05-27
All-ecommerce repeat purchase rate	25–30%	Opensend	2026-05-27
NPS usage by enterprise CX leaders	23%	TELUS/Statista 2025 via Referral Rock	2024-09-12 (secondary)

What Practitioners Report

CustomerGauge's B2B account-experience coverage (2023-07-10) framed EGR adoption as a competitive differentiator: firms tracking earned vs. bought growth can redirect investment from costly acquisition spend toward customer success and referral programmes that generate higher-quality, lower-cost growth. No independent ecommerce operators discussing their own EGR implementation were found in publicly accessible sources as of this research run (2026-08-05).

Warby Parker is cited in secondary sources as a practitioner case study — the eyewear brand reportedly uses EGR and found referred customers more profitable with lower acquisition cost than paid-channel customers (DestinationCRM via Reichheld talk summary; low confidence, no primary source confirmed).

[!unverified] Warby Parker EGR case: surfaced via a DestinationCRM article summarising a Reichheld talk. No primary Warby Parker publication or confirmed video transcript found to support this claim (as-of 2026-08-05).

Gaps (as of 2026-08-05)

• No EGR industry benchmarks by retail sub-sector (fashion, home goods, beauty, etc.) found in any source
• No public case studies from fashion/apparel ecommerce brands implementing EGR
• No evidence of GAAP regulatory progress on Reichheld's 2021 call
• No adoption-rate data on what proportion of retailers have implemented EGR (NPS adoption is documented at Fortune 1000 level; EGR equivalent does not exist)
• HBR "Net Promoter 3.0" (canonical primary source) is paywalled; all findings trace to it via Bain secondary or third-party summaries
• Reddit data unavailable (known recurring Cowork cloud gap — MCP not resolvable in this environment)
• YouTube transcripts unavailable (Apify MCP not present in Cowork cloud); 5 videos identified and summarised from web-indexed metadata/quotes