Q: Which formula correctly calculates the percentage change in an economic variable?

$$\text{Percentage change} = \frac{\text{Value in the second period} - \text{Value in the first period}}{\text{Value in the first period}} \times 100$$

Question 1

Which of the following best describes the concept of opportunity cost?

Accepted Answer

The value of the best alternative forgone when a choice is made.

Question 2

A rational decision-maker will:

Accepted Answer

Use all available information to compare costs and benefits before making a decision.

Question 3

Which of the following is an example of a positive economic statement?

Accepted Answer

Raising taxes will reduce consumer spending.

Question 4

Suppose a firm can produce a good using either more workers or more machines. If the cost of labor rises, what is the most likely response according to economic theory?

Accepted Answer

The firm will substitute machines for workers to lower costs.

Question 5

Which formula correctly calculates the percentage change in an economic variable?

Accepted Answer

$$	ext{Percentage change} = \frac{	ext{Value in the second period} - 	ext{Value in the first period}}{	ext{Value in the first period}} 	imes 100$$

Question 6

In a market economy, how are resources allocated?

Accepted Answer

By the interaction of households and firms in markets.

Question 7

Which of the following best illustrates the concept of marginal analysis?

Accepted Answer

Comparing the additional benefit of studying one more hour to the additional cost of not sleeping.

Question 8

If the area of a rectangle represents total revenue, and a firm sells 125,000 bottles at $2.00 each, what is the total revenue?

Accepted Answer

$$250,000$$

Question 9

Which of the following is a microeconomic issue?

Accepted Answer

How consumers react to changes in the prices of products.

Question 10

A government policy that redistributes income from high-income to low-income individuals is most likely to:

Accepted Answer

Improve equity but may reduce efficiency.

Question 11

Which of the following best describes allocative efficiency?

Accepted Answer

Production is in accordance with consumer preferences.

Question 12

If the slope of a line is calculated as $$\frac{\Delta y}{\Delta x}$$, what is the slope between the points (55, 14) and (65, 12)?

Accepted Answer

$$-0.2$$

Question 13

Which of the following is NOT a step in building an economic model?

Accepted Answer

Include all possible variables to ensure accuracy.

Question 14

A time-series graph with a truncated vertical axis can make changes appear:

Accepted Answer

Larger than they actually are.

Question 15

Which of the following is an example of voluntary exchange?

Accepted Answer

A buyer and seller both benefit from a transaction.

Question 16

If the area of a triangle on a graph is calculated as $$\frac{1}{2} 	imes 	ext{base} 	imes 	ext{height}$$, what is the area if the base is 25,000 and the height is $0.50?

Accepted Answer

$$6,250$$

Question 17

Which of the following best describes the difference between microeconomics and macroeconomics?

Accepted Answer

Microeconomics focuses on households and firms, while macroeconomics focuses on the economy as a whole.

Question 18

Which of the following is a normative statement?

Accepted Answer

The government should reduce taxes to stimulate growth.

Question 19

Why do economists often use linear approximations for non-linear relationships?

Accepted Answer

Because linear approximations make analysis and calculations easier.

Question 20

Which of the following is an example of people responding to incentives?

Accepted Answer

A government reduces sales tax, leading more people to buy goods.

Foundations of Microeconomics: Key Concepts, Models, and Graphical Analysis

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