Which statement correctly differentiates fixed costs and variable costs with examples?

Which statement correctly differentiates fixed costs and variable costs with examples?

• A. Fixed costs vary with activity (units produced); variable costs stay constant.
• B. Fixed costs remain constant regardless of activity (rent); variable costs change with activity (materials).
• C. Fixed costs are always labor; variable costs are always materials.
• D. Both fixed and variable costs remain constant in the short run.

Answer: (B)

Understanding how costs behave as production changes is essential. Fixed costs stay the same regardless of how much you produce in the relevant range, while variable costs move in direct proportion to activity. This is why describing fixed costs as remaining constant (for example, rent) and variable costs as changing with activity (for example, materials) is correct. The statement aligns with how businesses plan and analyze costs: rent is paid whether you produce a lot or a little, while materials rise as you produce more. For contrast, the other descriptions misstate cost behavior: fixed costs do not vary with activity; fixed costs are not always labor and variable costs are not always materials; and both types of costs do not stay constant in the short run since variable costs change with output. In short, this statement accurately captures how fixed and variable costs behave and their typical examples.

Understanding how costs behave as production changes is essential. Fixed costs stay the same regardless of how much you produce in the relevant range, while variable costs move in direct proportion to activity. This is why describing fixed costs as remaining constant (for example, rent) and variable costs as changing with activity (for example, materials) is correct. The statement aligns with how businesses plan and analyze costs: rent is paid whether you produce a lot or a little, while materials rise as you produce more. For contrast, the other descriptions misstate cost behavior: fixed costs do not vary with activity; fixed costs are not always labor and variable costs are not always materials; and both types of costs do not stay constant in the short run since variable costs change with output. In short, this statement accurately captures how fixed and variable costs behave and their typical examples.