Two approaches to emissions trading are cap-and-trade, in which an aggregate cap on emissions is distributed in the form of allowance permits, and baseline-and-credit, in which firms earn emission reduction credits for emissions below their baselines. Theoretical considerations suggest the long-run equilibria of the two plans will differ if baselines are proportional to output, because a variable baseline is equivalent to an output subsidy. As a first step towards testing the full long-run model, this paper reports on a laboratory experiment designed to test the prediction under fixed emission rates and variable output capacity. A computerized environment has been created in which subjects representing firms choose output capacities under fixed emission technology and participate in markets for emission rights and for output. Demand for output is simulated. All decisions are tracked through a double-entry bookkeeping system. Our evidence supports the theoretical prediction that aggregate output and emissions are significantly greater under a baseline-and-credit trading plan than under a comparable cap-and-trade plan.
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