Thanks for all your help!

Consider the series system below. As we discussed the Walmart examples, stage 1 is a Walmart distribution center, which serves demands at Stage 2 and 3. Stage 2 and 3 are Walmart local supermarkets, which supports demands at Stage 4, S and 6, 3', respectively. Stages 4, 5, 6, and 7 are Walmart neighborhood stores, which you can apply EOG inventory management policy. A] In this setting, how many Echelons will be needed if you want to apply series system approach? B} Please also describe composition of stages in each Echelon. C] Pick the largest echelon from your answer B). Please draw the inventory pattern over time in stages and in the largest echelon. You may take arbitrary m value