Abstract: This disclosure relates generally to analyzing product promotions, and more particularly to system and method for determining effectiveness of product promotions. In one embodiment, a method is provided for determining an effectiveness of a promotion. The method includes receiving data related to sales and promotions for a plurality of products. The plurality of products includes a plurality of aggressor products and a plurality of victim products. The method further includes analyzing the data to determine a set of significant aggressor products for each of the plurality of victim products, assessing an impact of each of the set of significant aggressor products on a respective victim product, and determining the effectiveness of the promotion with respect to a product based on the data related to sales of the product under the promotion, and the impact of the product on each of one or more associated victim products.