The supply curve of books (which are produced using paper made from trees) will shift to the left in response to: a) a decline in college tuition. b) a sharp increase in the demand for and construction of wood-frame homes. c) an increase in the supply of lumberjacks. d) an end to government regulations that limit timber harvesting in national forests. ****** Which of the following would shift a supply curve to the right? a) Taxes b) Import restrictions c) Duties d) Subsidies