EyeMasters is a regional chain of optical shops in the southwestern United States. They specialize in offering a large selection of eyeglass frames, and they provide while-you-wait service. EyeMasters has launched a vigorous advertising campaign promoting its two-for-the-price-of-one frame sales.

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EyeMasters expects to grow rapidly and increase its level of inventory. As the chief accountant of this company, you wish to install a perpetual inventory system. Write a memo to the company president to explain how that system would work.