The degree of effectiveness of a marketing order limiting shipments was examined by simulating prices, shipments, and total revenue. The results suggest that a supply management marketing order would be beneficial to Southeastern sweet onion producers. These findings reinforce the importance of a marketing plan for achieving price and revenue goals over the course of a shipping season. Optimal control appears appropriate as a tool to determine intraseasonal shipment goals for a number of commodities under the umbrella of a marketing order.