They could also require the installation of particular pollution control equipment (as when catalytic converters were required on automobiles), or the use of a particular production ingredient (as when lead was removed from gasoline). In other words, they can regulate outputs, inputs, production processes, emissions, and even the location of production in their attempt to produce an outcome. In chapters, we shall examine the various options policymakers have not only to show how they can mentally destructive behavior, but also to establish the degree to which they can promote efficiency.