Existing customers
Growth may come from solving more of the need, expanding categories, increasing frequency or retention, or improving service. The advantage is a known customer and existing trust; the risk is cannibalisation or subsidising behaviour that would happen anyway.
New segments
An adjacent segment may share a need but require a different proposition, channel and economics. Market size alone is insufficient: test customer access, willingness to pay, competitive density and the ability to adapt without damaging the core model.
New products and services
An additional offer strengthens the relationship when it uses an existing asset: brand, data, network, expertise, range or operating infrastructure. Synergy must be measurable; otherwise the company creates a second business with hidden investment and unclear ownership.
Channels and geography
E-commerce, partners, marketplaces, new store formats and regions expand access but alter margin, inventory, service and channel conflict. Assess total customer and channel economics, not incremental revenue alone.