Optimizing a location allocation-inventory problem in a two-echelon supply chain network: A modified fruit fly optimization algorithm.

•A distributer–retailer network for a location allocation-inventory control problem is derived.•The distance between the distributers and retailers are to be Euclidean and square Euclidean.•The products are purchased under AUD and IQD discount policies.•The goal is to find the optimal number of packets and the distributers’ locations.•A modified fly fruit optimization algorithm is used to solve the problem.