ANSWERS TO QUESTIONS
1. The differences among the terms depreciation, depletion, and amortization are that they
imply a cost allocation of different types of assets. Depreciation is employed to indicate
that tangible plant assets have decreased in carrying value. Where natural resources
(wasting assets) such as timber, oil, coal, and lead are involved, the term depletion is used.
The expiration of intangible assets such as patents or copyrights is referred to as
amortization.
2. The factors relevant in determining the annual depreciation for a depreciable asset are
the initial recorded amount (cost), estimated salvage value, estimated useful life, and
depreciation method.
Assets are typically recorded at their acquisition cost, which is in most cases objectively
determinable. But cost assignments in other cases—“basket purchases” and the selection of
an implicit interest rate in asset acquisition under deferred-payment plans—may be quite
subjective, involving considerable judgment.
The salvage value is an estimate of an amount potentially realizable when the asset is
retired from service. The estimate is based on judgment and is affected by the length of the
useful life of the asset.
The useful life is also based on judgment. It involves selecting the “unit” of measure of
service life and estimating the number of such units embodied in the asset. Such units may
be measured in terms of time periods or in terms of activity (for example, years or machine
hours). When selecting the life, one should select the lower (shorter) of the physical life or
the economic life. Physical life involves wear and tear and casualties; economic life
involves such things as technological obsolescence and inadequacy.
Selecting the depreciation method is generally a judgment decision, but a method may be
inherent in the definition adopted for the units of service life, as discussed earlier. For
example, if such units are machine hours, the method is a function of the number of
machine hours used during each period. A method should be selected that will best
measure the portion of services expiring each period. Once a method is selected, it may be
objectively applied by using a predetermined, objectively derived formula.
3. Accounting depreciation is defined as an accounting process of allocating the costs of
tangible assets to expense in a systematic and rational manner to the periods expected to