【单选题】If consumers view cappuccinos and lattés as substitutes, what would happen to the equilibrium price and quantity of lattés if the price of cappuccinos rises?
A.
Both the equilibrium price and quantity would increase.
B.
Both the equilibrium price and quantity would decrease.
C.
The equilibrium price would increase, and the equilibrium quantity would decrease.
D.
The equilibrium price would decrease, and the equilibrium quantity would increase.
【单选题】If scientists discover that steamed milk, which is used to make lattés, prevents heart attacks, what would happen to the equilibrium price and quantity of lattés?
A.
Both the equilibrium price and quantity would increase.
B.
Both the equilibrium price and quantity would decrease.
C.
The equilibrium price would increase, and the equilibrium quantity would decrease.
D.
The equilibrium price would decrease, and the equilibrium quantity would increase.
【单选题】If consumers often purchase muffins to eat while they drink their lattés at local coffee shops, what would happen to the equilibrium price and quantity of lattés if the price of muffins falls?
A.
Both the equilibrium price and quantity would increase.
B.
Both the equilibrium price and quantity would decrease.
C.
The equilibrium price would increase, and the equilibrium quantity would decrease.
D.
The equilibrium price would decrease, and the equilibrium quantity would increase.