Traditionally, the BWE has been studied in serial supply chains. That is also the setting of the famous beer game, where the typical demand pattern across the supply chain looks like this: for a relatively small change in demand seen by the retailer, the demand variability progressively increases at the more upstream wholesaler, distributor, and factory (see the figure below). This leads to capacity shortages, stockouts, excess inventory, and increased operational costs. No wonder BWE has a lot of attention among academics and practitioners alike.