Numbers Tell a Story

Costs associated with creating the catalog, namely advertising costs. Ultimately, you want to evaluate the performance of items in terms of their contribution to overhead and profit (assuming you're breaking even on fulfillment).

A marked-up catalog where all of the items are denoted with unit and dollar sales. This is a helpful visual tool that complements your data analysis. If a product is performing exceptionally well, it's helpful to know if a specific creative treatment is facilitating sales. If so, perhaps that treatment can be applied to other items to improve their sales as well.