Final answer:
The major problem of accounting for intangibles is determining fair value, separability, and useful life.
Step-by-step explanation:
The major problem of accounting for intangibles is determining fair value. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.
Intangible assets such as patents, trademarks, and copyrights do not have a readily determinable market value and therefore require estimation to determine their fair value.
Other factors like separability (whether the asset can be separated from the business) and useful life (how long the asset is expected to provide benefits) are also important in accounting for intangibles.