In managerial accounting, what distinguishes fixed costs from variable costs?

In managerial accounting, what distinguishes fixed costs from variable costs?

• A. Fixed costs do not vary with output; variable costs vary with production volume.
• B. Fixed costs increase with output; variable costs stay constant.
• C. Fixed costs are the only costs; variable costs are sunk.
• D. Fixed costs depend on marketing spend; variable costs depend on labor.

Answer: (A)

Costs in managerial accounting behave differently as production changes. Fixed costs stay the same in total regardless of how much you produce (within a relevant range), such as rent or straight-line depreciation. Variable costs, on the other hand, rise or fall with production volume because they depend on the amount of output—think of materials and direct labor that are tied to units produced. Because the total fixed cost doesn’t move with output, the fixed cost per unit declines as you produce more units. This is why the statement that fixed costs do not vary with output while variable costs vary with production volume is the best description. The other descriptions don’t fit the standard behavior: fixed costs don’t increase with output and variable costs don’t stay constant as you scale production; claiming fixed costs are the only costs with variable costs being sunk misstates how costs behave in production; and tying fixed costs to marketing spend and variable costs to labor ignores the fundamental distinction in how costs respond to changes in activity.

Costs in managerial accounting behave differently as production changes. Fixed costs stay the same in total regardless of how much you produce (within a relevant range), such as rent or straight-line depreciation. Variable costs, on the other hand, rise or fall with production volume because they depend on the amount of output—think of materials and direct labor that are tied to units produced. Because the total fixed cost doesn’t move with output, the fixed cost per unit declines as you produce more units.

This is why the statement that fixed costs do not vary with output while variable costs vary with production volume is the best description. The other descriptions don’t fit the standard behavior: fixed costs don’t increase with output and variable costs don’t stay constant as you scale production; claiming fixed costs are the only costs with variable costs being sunk misstates how costs behave in production; and tying fixed costs to marketing spend and variable costs to labor ignores the fundamental distinction in how costs respond to changes in activity.