Use your newsagency software to compare suppliers. This is easy to create a report. I do it for my newsagencies, especially for magazines and gifts.
For magazines I compare like for like titles: Woman’s Day and New Idea, Take 5 and That’s Life etc. This quickly identifies if one title is performing differently to a direct competitor.
For gifts I compare everything from one supplier with everything from another. I look at space allocation and investment in inventory. The comparison can help me decide which supplier to focus on.