What is the difference between fixed costs and variable costs?

What is the difference between fixed costs and variable costs?

• A. Fixed costs remain constant regardless of output; variable costs change with production levels.
• B. Fixed costs change with output; variable costs stay constant.
• C. Fixed costs are only one-time expenses; variable costs are salaries.
• D. Fixed costs are only for manufacturing; variable costs apply to services.

Answer: (A)

Costs behave differently as you produce more or less. Fixed costs stay the same regardless of how much you produce—things like rent, insurance, and other payments that don’t vary with output. Variable costs move with production; the more units you make, the more materials and direct labor you need, so total variable costs rise as output increases. Because of that, total cost is the sum of fixed and variable costs, and the fixed cost per unit falls as you spread that same fixed amount over more units, while the variable cost per unit stays about the same if the per‑unit cost doesn’t change. The other descriptions mix up these relationships—for example, fixed costs aren’t just one-time expenses, they don’t change with output, and both manufacturing and services have fixed and variable costs.

Costs behave differently as you produce more or less. Fixed costs stay the same regardless of how much you produce—things like rent, insurance, and other payments that don’t vary with output. Variable costs move with production; the more units you make, the more materials and direct labor you need, so total variable costs rise as output increases. Because of that, total cost is the sum of fixed and variable costs, and the fixed cost per unit falls as you spread that same fixed amount over more units, while the variable cost per unit stays about the same if the per‑unit cost doesn’t change. The other descriptions mix up these relationships—for example, fixed costs aren’t just one-time expenses, they don’t change with output, and both manufacturing and services have fixed and variable costs.