I have an anecdote too - I used to work for SAP and lead their FMCG practice in EMEA. We did many ERP projects for large grocery chains and we could see that a

I have an anecdote too - I used to work for SAP and lead their FMCG practice in EMEA. We did many ERP projects for large grocery chains and we could see that a lot of their material waste was down to damaged good and expired goods. Two of the largest chains had a field in the their system to track items that had expired due to being left to rot on the shelves, the amount of fruit and veg that expired was large and it was mostly oddly shaped veg. We introduced a business process where the suppliers could only send produce that met a certain 'grade', this radically changed the amount of wastage on the store side but increased the wastage on the supply side. Programmes like 'the odd bunch' where produce that looks funny is sold cheaper has gone some way to addressing the issue for certain grocery chains. I don't believe there are any public studies on individual store wastage over this issue.