Propagation of Data Error and Parametric Sensitivity in Computable General Equilibrium Models |
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Authors: | Joshua Elliott Meredith Franklin Ian Foster Todd Munson Margaret Loudermilk |
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Affiliation: | 1. Computation Institute, University of Chicago and Argonne National Laboratory, Chicago, USA 2. University of Chicago and Argonne National Laboratory, Chicago, USA
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Abstract: | While computable general equilibrium (CGE) models are a well-established tool in economic analyses, it is often difficult
to disentangle the effects of policies of interest from that of the assumptions made regarding the underlying calibration
data and model parameters. To characterize the behavior of a CGE model of carbon output with respect to two of these assumptions,
we perform a large-scale Monte Carlo experiment to examine its sensitivity to base year calibration data and elasticity of
substitution parameters in the absence of a policy change. By examining a variety of output variables at different levels
of economic and geographic aggregation, we assess how these forms of uncertainty impact the conclusions that can be drawn
from the model simulations. We find greater sensitivity to uncertainty in the elasticity of substitution parameters than to
uncertainty in the base-year data as the projection period increases. While many model simulations were conducted to generate
large output samples, we find that few are required to capture the mean model response of the variables tested. However, characterizing
standard errors and empirical probability distribution functions is not possible without a large number of simulations. |
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