Voluntary agreements (VAs) have been widely used in environmental policymaking over the past 20 years. This paper reviews relevant theoretical and empirical literature on VAs, assessing their performance in terms of effectiveness and efficiency. Effectiveness is evaluated on three criteria: (i)...

This article compares tradable permits with tradable credits, two distinct economic instruments of environmental policy. It is demonstrated that under credit trading, which is an addition to (relative) emission standards, residual emissions are free of cost. Under permit trading (cap-and-trade),...