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This paper analyzes the effects of the choice between price-based and quantity-based emission regulations on compliance incentives and social welfare in the presence of incomplete enforcement and technology adoption. We show that in contrast to taxes, the extent of violations under tradable emission permits (TEPs) decreases with the rate of technology adoption. However, in terms of welfare, the ranking of the instruments is not so straightforward: taxes induce lower emission damages while TEPs induce lower abatement, investment, and expected enforcement costs. Thereby, the overall ranking depends on the extent to which these effects offset each other.