Total pollution emitted by U.S. manufacturers declined over the past 30 years by about 60 percent, even though real manufacturing output increased 70 percent. This improvement must result from a combination of two trends: (1) changes in production or abatement processes (quot;technologyquot;);...

Total pollution emitted by U.S. manufacturers declined over the past 30 years by about 60 percent, even though real manufacturing output increased 70 percent. This improvement must result from a combination of two trends: (1) changes in production or abatement processes ("technology"); or (2)...

Total pollution emitted by U.S. manufacturers declined over the past 30 years, even though manufacturing output increased. This improvement must result from one of two trends: (1) changes in production or abatement processes ("technology"); or (2) changes in the mix of goods manufactured in the...