Question

Which of the following variables is defined for a time period?

• A. Income
• B. Consumption
• C. Investment
• D. All of these

Hint:

Variables like income, consumption, and investment are measured over a time period, indicating their time-based nature.

Answer 1

The Correct Option is D

Step 1: Understanding variables for a time period.
Some economic variables, such as income, consumption, and investment, are defined over a specific time period. These variables change and are measured over time, making them time-dependent.

Step 2: Analyzing the options.
(A) Income: Correct. Income is typically defined over a period, such as monthly or yearly income.
(B) Consumption: Correct. Consumption is also defined over time, such as weekly or yearly consumption of goods and services.
(C) Investment: Correct. Investment is defined over a specific time period, like annual investments made by individuals or businesses.
(D) All of these: Correct. All of the above variables are defined for a specific time period.

Step 3: Conclusion.
The correct answer is (D) All of these, as income, consumption, and investment are all time-dependent variables.