Emissions trading is becoming increasingly popular in environmental law. Allowances to trade emissions can either be auctioned off or handed out free of charge by means of grandfathering. Although grandfathering is frequently used in emissions trading schemes, it is a popular view in the...

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),...