Background: Policymakers' use of high-stakes exams to improve students' academic achievement affects teachers and their tenure in the field at all levels of schooling. Novice teachers now being inducted into the field have been educated almost exclusively in these high-stakes learning environments. Yet, how their familiarity with these contexts…

Maintains that the equal marginal value principle may not be optimal in the analysis of the cost-effectiveness of policies to reduce auto emissions, the economics of garbage disposal, and the economics of pollution abatement. Argues that examining these exceptions can help students understand the equal marginal value principle. (MJP)