Auditing and Accounting Cases: Investigating Issues of Fraud and Professional Ethics 3rd Edition by Jay Thibodeau,Deborah Freier

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Under what circumstances is a company allowed to change the useful life and salvage value of its fixed assets under GAAP? As an auditor, what type of evidence would you want to examine to determine whether Waste Management's decision to change the useful life and salvage value of its assets was appropriate under GAAP?