Which of the following is used to show how the sales volume of a product can change over time?

• A. A time-series graph
• B. A production possibilities frontier
• C. A supply curve
• D. A demand curve

Answer: (A)

Verified step by step guidance

1. Understand the question is asking about a graphical tool that shows changes in sales volume of a product over time.
2. Recall that a time-series graph is specifically designed to display data points sequentially over time, making it ideal for showing trends or changes in sales volume.
3. Recognize that a production possibilities frontier (PPF) illustrates trade-offs between two goods, not changes over time.
4. Know that a supply curve shows the relationship between price and quantity supplied at a given time, not over a period.
5. Know that a demand curve shows the relationship between price and quantity demanded at a given time, not over a period.