Shorten the lead time will decrease the bullwhip effect.Centralized demand information can significantly reduce the bullwhip effect. 3.Make a comprehensive analysis for different modes and provide some suggestions for the case of Barilla SPA(A)in the text. Barilla can reduce the bullwhip effect by centralizing demand information and improve the produce process,short the lead time.Shorten the lead time will decrease the bullwhip effect. Centralized demand information can significantly reduce the bullwhip effect. 3. Make a comprehensive analysis for different modes and provide some suggestions for the case of Barilla SPA(A) in the text. Barilla can reduce the bullwhip effect by centralizing demand information and improve the produce process, short the lead time