The cost that will be zero if a firm produces nothing is variable cost because it is a cost that changes with level of output.
What is variable cost?
Variable cost refers to the cost that vary with the level of output. This means that at every activity leve, the variable cost changes with it.
The above means that a constant amount per unit produced is the variable cost of manufacturing which implies that once the output is zero, the variable cost will be zero as well.
Hence, the cost that will be zero if a firm produces nothing is variable cost.
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