“…Conversely, the sign of Δ is negative (quantities are preferred over ideological, legal, social, historical, administrative, motivational, informational, timing, lobbying, monitoring and enforcing considerations, or any other issues that are not purely economic, are beyond the scope of this paper. For a balanced and overarching discussion of both theoretical and practical issues involved in choosing between carbon taxes and a cap-and-trade system, see the review article of Goulder and Schein (2013) and the many references cited therein. prices) when the marginal benefit curve is steeper than the marginal cost curve.…”