I do not agree with the given statement that is "Only variable costs can be differential costs.".
The difference in the costs of two alternative decisions is referred to as differential cost.
When a company is faced with several similar options, it must make a decision by selecting one and discarding the other.
Variable costs in cost accounting are costs that vary according to how much a company produces.
Variable costs are typically proportional to output.
As a result, the cost difference between two alternatives, rather than the fixed and variable nature of costs, is relevant for decision-making.
Hence, I disagree with the statement given in the question.
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