Bullwhip effect in a supply chain, makes inefficiencies such as excess inventory and
overdue orders during the chain. These problems can be reduced by appropriate
predictions. Forecasting must be done in all levels of a supply chain. This research
addresses the problem of optimal combination of forecasting to reduce the bullwhip effect in
a four-level supply chain when demand is variable. For this purpose, a four-level supply
chain has been considered. Moving average, exponential smoothing, linear regression and …