Investopedia explains 'Accounting Rate of Return - ARR'
ARR is considered a straight-line method of gathering quantitative information. While this is a positive measure in some aspects, its lack of sophistication is also a drawback. ARR does not consider the time value of money, which means that returns taken in during later years may be worth less than those taken in now, and does not consider cash flows, which can be an integral part of maintaining a business.
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