John Cochrane on the role of cheap clean energy which by itself will not reduce CO2 in the long run: The standard vision in policy discussions assumes infinite substitutability. As soon as the cost of clean energy is lower than the cost of carbon-emitting energy, everyone substitutes completely to the latter and the oil and coal stay in the ground. … But as long as the elasticity of substitution is finite … then the carbon comes out of the ground. As you use less and less, the...
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