What Is Investor Network Expansion Rate (INER)?

Investor Network Expansion Rate (INER) measures the rate at which existing investor relationships generate new investor relationships through referrals, introductions, and advocacy. It captures the compounding effect of a firm's relationship base.

Why it matters

A firm that relies solely on outbound acquisition faces rising costs over time, while one that generates growth from its own investor network builds a more durable and efficient acquisition engine, reducing pressure on capital acquisition costs.

How to calculate it

Divide the number of new investor relationships originating from existing investor introductions by the total number of existing investor relationships during the same period, then track the resulting rate over time.

What good looks like

In most cases, an increasing INER indicates a healthy, advocacy-driven network. A stronger result may suggest that investor experience quality is strong enough that investors are willing to put their own reputations behind an introduction.

Common failure mode

A common failure mode is failing to distinguish organic advocacy from incentivized referral activity, which can make the network appear more self-sustaining than it actually is.

Relationship to other measures

INER is a compounding Relationship Capital metric that signals long-term acquisition sustainability. It is closely connected to Investor Referral Value, Investor Referral Conversion Rate, and Relationship Capital Growth Rate.

Related concepts

• Investor Referral Value (IRV)
• Investor Referral Conversion Rate (IRCR)
• Relationship Capital Growth Rate (RCGR)
• Acquisition Capital Indicator (ACI)