Which equation best represents total cost in the standard model?

Which equation best represents total cost in the standard model?

• A. Total cost = Fixed cost + (Variable cost per unit × Output)
• B. Total cost = Variable cost × Output
• C. Total cost = Fixed cost × Output
• D. Total cost = Variable cost per unit + Fixed cost per unit

Answer: (A)

In the standard cost model, total cost is made up of fixed costs plus the variable costs that change with production. The total variable cost is the variable cost per unit multiplied by the quantity produced, and adding the fixed cost gives the total cost: TC = FC + (VC per unit × Output). This captures how some costs stay constant regardless of output while others rise with production. The other forms miss this structure: total cost should include fixed costs, not multiply them by output; it should include fixed costs separately rather than adding a per-unit fixed component; and it should include the total variable cost rather than ignoring fixed costs entirely.

In the standard cost model, total cost is made up of fixed costs plus the variable costs that change with production. The total variable cost is the variable cost per unit multiplied by the quantity produced, and adding the fixed cost gives the total cost: TC = FC + (VC per unit × Output). This captures how some costs stay constant regardless of output while others rise with production.

The other forms miss this structure: total cost should include fixed costs, not multiply them by output; it should include fixed costs separately rather than adding a per-unit fixed component; and it should include the total variable cost rather than ignoring fixed costs entirely.