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One reason that weighted-average costing may be preferred over FIFO costing in process costing systems is because
over the course of a year, it smooths out costs when input costs fluctuate markedly from month to month.
it shows the same cost per unit than FIFO with fewer computations.
it computes the cost per unit for all the work done to date, not just completed units.
over the course of a year, it smooths out costs as long as input costs do not fluctuate markedly from month to month.