This article describes a classroom game in which students simulate the
U.S. EPA's market for emission allowances to understand the efficienc
y benefits of market-based incentives for pollution control. It can be
used in either a principles or environmental economics course. Acting
as managers of coal-fired power plants facing different clean-zip cos
ts, students compare the cost of pollution reduction to the cost of ac
quiring permits to emit pollution. The game can be conducted in one 50
-minute class period with discussion of the results carried over to th
e next class.