Value investors also use the P/S ratio. The P/S ratio is calculated as price divided by sales. This is a preferred metric because revenue can't really be manipulated, so sales are often a truer performance indicator. MMS has a P/S ratio of 0.75. This compares to its industry's average P/S of 0.77. Finally, investors will want to recognize that MMS has a P/CF ratio of 9.39. This data point considers a firm's operating cash flow and is frequently used to find companies that are undervalued when considering th ...