【单选题】The difference between a change in quantity demanded and a change in demand is that a change in:
A.
quantity demanded is caused by a change in a good's own current price, while a change in demand is caused by a change in some other variable, such as income, tastes, or expectations.
B.
demand is caused by a change in a good's own current price, while a change in quantity demanded is caused by a change in some other variable, such as income, tastes, or expectations.
C.
quantity demanded is a change in the amount people actually buy, while a change in demand is a change in the amount they want to buy.
D.
A change in demand and a change in quantity demanded are the same thing.
【单选题】The difference between a change in quantity supplied and a change in supply is that a change in:
A.
quantity supplied is caused by a change in a good's own, current price, while a change in supply is caused by a change in some other variable, such as input prices, prices of related goods, expectations, or taxes.
B.
supply is caused by a change in a good's own, current price, while a change in the quantity supplied is caused by a change in some other variable, such as input prices, prices of related goods, expectations, or taxes.
C.
quantity supplied is a change in the amount people want to sell, while a change in supply is a change in the amount they actually sell.
D.
supply and a change in the quantity supplied are the same thing.