Most accounting charges relate to what's going on, even if they don't precisely measure it. As an example, depreciation charges can't with precision calibrate the decline in value that physical assets suffer, but these charges do at least describe something that is truly occurring: Physical assets invariably deteriorate. Correspondingly, obsolescence charges for inventories, bad debt charges for receivables and accruals for warranties are among the charges that reflect true costs. The annual charges for these expenses can't be exactly measured, but the necessity for estimating them is obvious.
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