Six MBA students say a single-strength tart cherry juice produced and marketed by a grower cooperative could be a marketplace winner. What the tart cherry industry needs is a cooperative of growers that focuses on growing and marketing one outstanding product, like natural, healthful cherry juice. If that recipe sounds familiar, it should be. In recent years, Ocean Spray, Welch’s, and Sunkist have ridden that formula to success with cranberries, grapes, and oranges. Ocean Spray, with its humorous advertisements featuring  growers standing in hip boots in cranberry bogs, has converted a sour Thanksgiving-only fruit into a ­year-round superfruit and greatly […]