How constant is constant elasticity of substitution? Endogenous substitution between clean and dirty energy
构建动态一般均衡模型，研究清洁与污染能源之间的替代弹性如何随清洁投入占比内生变化，发现内生替代能力会放大定向技术变革的影响并加速绿色转型。
The degree of substitutability between clean and dirty energy plays a central role in leading economic analyses of optimal environmental policy. Despite the importance, assuming a constant and exogenous elasticity of substitution has been a dominant theoretical approach. We challenge this assumption by developing a dynamic general equilibrium model with an endogenous elasticity of substitution that interacts with the relative share of clean inputs in the economy. We find strong dynamic feedback effects arising from endogenous substitution capacity that amplifies the impact of directed technical change and accelerates the transition to a green economy.