I am doing some research (not selling anything) on the issues retailers face when planning discount based promotions. Especially the problem of cannibalization — where the discounting of a product results in reduced sales of other (often higher priced) products in your catalog. Eating into your revenue and potentially nullifying any sales lift caused by the discounted pricing. Managing this requires a deep understanding of the relationships between your products and rigorous testing of historical promotions.
I am looking to get some insights into your personal experiences with promotions that did not result in the sales lift that you may have expected. So I would greatly appreciate any interesting insights that you might like to share. I have done some academic research in this area, so I might even be able to give you some insights as well!