The depreciation method that allocates an equal portion of the total depreciable cost for a plant asset to each unit produced is called:

Accelerated depreciation

Explanation:

The term that is being described in the question is known as an Accelerated depreciation. In other words, this is a depreciation method where an asset loses its book value at a much more rapid pace than more traditional methods. This method is mostly used in accounting or for income tax purposes because it allows for a greater deduction in the first couple of years of the asset's life cycle.