Distribution research involves determining the optimal number and location of salespeople, retail outlets, warehouses, and discounts. This can involve simulating different scenarios to analyze costs and delivery times for different locations. Common methods include center-of-gravity simulation to minimize distance to customers, computerized simulation models to determine the optimal number and placement of warehouses, and trade area analysis to evaluate market positioning and customer bases. Outlet location research examines methods for individual companies and chains, while research on sales representatives analyzes the optimal number for a given territory.