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13. How shifts in demand and supply affect equilibrium Consider the market for pens. Suppose that the number of students with an allergy to pencil erasers increases, causing more students to switch from pencils to pens in school. Moreover, the price of ink, an important input in pen production, has increased considerably. On the following graph, labeled Scenario 1, indicate the effect these two events have on the demand for and supply of pens. Note: Select and drag one or both of the curves to the desired position. Curves will snap into position, so if you try to move a curve and it snaps back to its original position, just drag it a little farther. Scenario 1 Demand Supply CE(Dollars per pen)
Scenario 1 Demand Supply PRICE (Dollars per pen) QUANTITY (Millions of pens) Next, complete the following graph, labeled Scenario 2, by shifting the supply and demand curves in the same way that you did on the Scenario 1
Next, complete the following graph, labeled Scenario 2, by shifting the supply and demand curves in the same way that you did on the Scenario 1 graph. Scenario 2 Demand Supply PRICE (Dollars per pen) QUANTITY (Millions of pens)
Compare both the Scenario 1 and Scenario 2 graphs. Notice that after completing both graphs, you can now see a difference between them that wasn’t apparent before the shifts because each graph indicates different magnitudes for the supply and demand shifts in the market for pens. Use the results of your answers on both the Scenario 1 and Scenario 2 graphs to complete the following tabi. Begin by indicating the overall change in the equilibrium price and quantity after the shirt in demand or supply for each shirtmagnitude scenario. Then, in the final column, indicate the resulting change in the equilibrium price and quantity when supply and demand shift in the direction you previously indicated on both graphs. If you cannot determine the answer without knowing the magnitude of the shirts, choose Cannot determine Change in Equilibrium Objects Scenario 2 When Shirt Magnitudes Are Unknown Equilibrium Object Scenario 1 Price Quantity True or False: When both the demand and supply curves shin, you can ways determine the effect on price and quantity without knowing the magnitude of the shifts. True False
esht apparent before the shirts because each graph indicates different magnitudes for the supply and demand shifts in the market for pens. Jse the results of your answers on both the Scenario 1 and Scenario 2 graphs to complete the following table. Begin by indicating the overall change in the equilibrium price and quantity after the shift in demand or supply for each shiftmagnitude scenario. Then, in the final column, indicate the resulting change in the equilibrium price and quantity when supply and demand shit in the direction you previously indicated on both graphs. If you cannot determine the answer without knowing the magnitude of the shifts, choose Cannot determine. Change in Equilibrium Objects Scenario 2 When Shift Magnitudes Are Unknown Equilibrium Object Scenario 1 Price Quantity Cannot determine Decreases bly curves shirt, you can always determine the effect on price and quantity without knowing the True or False: When both magnitude of the shirts Increases True False
Answer
Scenario 1  Scenario 2  When shift magnitudes are unknown 

Price  Increases  Increases  Increases 
Quantity  Decreases  Increases  Cannot determine 
Refer the attached image
Without knowing the magnitude of
shift we cannot determine the effect. Therefore, the statement is
False.
Scenario 1 10 9 Supply 8 7 PRICE (Dollars per pen) Demand 2 1 0 1 2 + + 3 5 6 7 QUANTITY (Millions of pens) 4 8 8 9 10
Scenario 2 10 9 Supply 8 PRICE (Dollars per pen) Demand 2 + + 0 1 2 8 9 10 3 5 6 7 QUANTITY (Millions of pens)
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