Answer:
A. Decrease in supply
B. Increase in quantity supplied.
C. Increase in supply
D. Decrease in supply
Explanation:
If the price of paper increases, the cost of production increases and supply falls.
If the price of economics textbooks increases, the quantity supplied increases in line with the law of supply.
If the number of publishers increase, the supply would increase.
If there are expectations that prices would rise in the future, suppliers would decrease supply now and increase it in the future in order to earn a higher revenue.
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