ROLLING MEADOWS, Ill. -- A pair of economic-impact studies performed on behalf of the Corrugated Packaging Council found that a mixed environment of returnable plastic and corrugated cardboard containers increased a retailer's cost-to-sell in the produce department. Using Activity-Based Costing comparisions, the polls also determined that all product moves through the distribution system more efficiently when pallets are uniform. Similarly, both boxes generated similar levels of product damage, according to CPC officials. However, reclamation programs for RPCs increased retailer handling costs by nearly 11%, averaging $0.13 per container. Stores absorbed 28% of those costs, and warehouses bore 72%, researchers found.