RT Journal Article SR Electronic T1 Emissions Trading: ERCs or Allowances? JF Land Economics JO Land Econ FD University of Wisconsin Press SP 513 OP 526 DO 10.2307/3146937 VO 77 IS 4 A1 Dewees, Donald N. YR 2001 UL http://le.uwpress.org/content/77/4/513.abstract AB Emissions trading takes place from two alternative baselines: 1) emission reduction credits (ERCs) in which the baseline is existing regulations which are often activity-based; or 2) cap-and-trade which specifies the total allowable emissions. This paper examines the effects of these two tradable permit systems on marginal and average costs for the firm, using electricity generation as an example. The ERC system subsidizes the activity level to which it is tied and fails to incorporate the full cost of external harm into the product price. If the permit limit is chosen efficiently, the cap-and-trade system is more efficient. (JEL Q25, Q28)