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Which of the following would be most likely to lead to an increased equilibrium price and equilibrium quantity in a perfectly-competitive market for paper?
The increased popularity of email and electronic messaging leads people to stop writing letters.
Global warming decreases the number of trees, the pulp of which is used to make paper.
New technology increases the efficiency of paper production.
Extreme couponing leads people to get multiple subscriptions to Sunday newspapers.
College professors require that students purchase e-books rather than traditional textbooks,