The differential effects of esg performance on cost of capital: Growth opportunities and non-linear impacts

While ESG initiatives have attracted $30 trillion in global investment, their impact on firms’ cost of capital remains paradoxical, with studies reporting effects ranging from substantial reductions to negligible impacts. We resolve this puzzle by showing that ESG’s financing benefits are fundamentally contingent on firm characteristics. Using panel data from 1093 US firms (2011–2022) with two-stage least squares and quantile regression, we document three key findings. First, ESG’s impact on weighted average cost of capital intensifies significantly with growth opportunities, with higher Tobin's Q firms experiencing substantially amplified benefits from ESG investments. Second, the relationship exhibits strong non-linearity; firms in the 90th WACC percentile experience three times the cost reduction of those in the 10th percentile. Third, governance mechanisms dominate environmental and social factors in reducing financing costs, particularly for high-growth firms. These findings advance our understanding by establishing boundary conditions for ESG's value, challenging assumptions of homogeneous ESG benefits, and providing precise guidance for capital allocation. For practitioners, we identify when ESG investments yield maximum returns: high-growth firms and those facing elevated financing costs capture disproportionate benefits, while small firms may experience cost increases. Our results suggest ESG creates value through reduced information asymmetry and enhanced stakeholder confidence, but only when firms possess characteristics that amplify these mechanisms.