AP Microeconomics : Quantity Equilibrium

Study concepts, example questions & explanations for AP Microeconomics

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Example Questions

Example Question #1 : Quantity Equilibrium

If good X and good Y are substitutes, an increase in the price of good X will lead to which of the following?

Possible Answers:

a decrease in supply for good Y

an increase in supply for good Y

an increase in demand for good Y

a decrease in demand for good Y

Correct answer:

an increase in demand for good Y

Explanation:

The change in price of a substitute good shifts demand.

An increase in the price of good X prompts consumers to use good Y instead of good X (i.e. substituting good X for good Y), resulting in increased demand for good Y.

Example Question #1 : Long Run Market Equilibrium

As consumption of a particular good increases, the satisfaction gained from consuming one additional unit of the good eventually ___________.

Possible Answers:

decreases

increases

equals 1

equals 0

Correct answer:

decreases

Explanation:

The law of diminishing marginal utility states that as consumption of a particular good increases, the satisfaction gained from consuming one additional unit (i.e. the marginal utility of the good) eventually decreases.

For example, consider eating chocolate bars. The increase in satisfaction resulting from eating the first chocolate bar is probably higher than the increase in satisfaction from eating the 12th chocolate bar. In other words, the marginal utility has decreased.

 

 

 

 

Example Question #11 : Side By Side Graphs

If the market for Good X is in equilibrium, which of the following would NOT cause a decrease in demand for Good X?

Possible Answers:

Consumers expect that the price of Good X will decrease.

A newspaper reports that Good X is harmful to the health of consumers.

The number of buyers of Good X decreases.

The price of a substitute good increases.

The price of a substitute good decreases.

Correct answer:

The price of a substitute good increases.

Explanation:

Of the five answer choices, only an increase in the price of a substitute good would cause the demand curve to increase. This result reflects the fact that when the price of the substitute good increases, consumers are less likely to buy that good and instead buy more of Good X.

All of the other answer choices would cause the demand curve to decrease.

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