TLDR:
The double bottom line is a business philosophy that measures company performance on both financial returns and social/environmental impact, used by impact investors and social enterprises.
Double Bottom Line Business Models
Double bottom line businesses integrate social or environmental mission directly into their commercial model, not as an add-on CSR program. Examples include TOMS Shoes (one-for-one donation model), Patagonia (environmental activism built into product strategy), and Warby Parker (vision care access alongside premium eyewear). The challenge is ensuring the social mission genuinely creates business differentiation rather than being perceived as marketing — consumers are increasingly skeptical of ‘impact washing.’
For investors, double bottom line businesses present unique evaluation challenges: impact must be measured alongside financial returns. Impact-first investors may accept lower financial returns for higher social impact; commercial-first investors view impact as a brand differentiator supporting premium pricing and loyalty. The B Impact Assessment, SROI framework, and UN SDG alignment framework provide structured tools for quantifying social and environmental impact alongside financial metrics.