Abstract: Sales transaction data of products sold at a store of a retailer is employed to identify opportunities to reallocate product inventory among the products based on characteristics of sales of the products. The sales transaction data is employed to determine characteristics of product sales, including, e.g., sales volume and sell-through. The number of units of products inventoried in a store can be reallocated based on sales volume and sell-through of the products indicated by the sales transaction data. After reallocation to determine new inventory levels for the products, an estimate of sales performance for the products can be determined at the new inventory levels and the estimated sales can be compared to past actual sales measurements to determine the potential effect of changing the number of units of products allocated to inventory in a store in a retail chain of a retailer.