Counterproductive impact investing: The impact elasticity of brown and green firms

Abstract

counterproductive sustainable investing: the impact elasticity of brown and green firms* samuel m. hartzmark kelly shue march 2023 first draft november 2022 abstract we develop a new measure of impact elasticity, defined as a firm’s change in environmental impact due to a change in its cost of capital. we show empirically that a reduction in financing costs for firms that are already green leads to small improvements in impact at best. in contrast, increasing financing costs for brown firms leads to large negative changes in firm impact. thus, sustainable investing that directs capital away from brown firms and toward green firms may be counterproductive, in that it makes brown firms more brown without making green firms more green. we further show that brown firms face very weak incentives to become more green. due to a mistaken focus on percentage reductions in emissions, the sustainable investing movement primarily rewards green firms for economically trivial reductions in their already low levels of emissions. *respective contact samuel.hartzmark@bc.edu, boston college and nber; kelly.shue@yale.edu, yale school of management and nber. we thank yiyuan wang for excellent research assistance. this research was funded in part by the international center for finance at yale som. information and affiliations are: a wise man gets more use from his enemies than a fool from his friends. -baltasar gracian i. introduction sustainable investing has exploded in popularity, with $35 …

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