Bullwhip Effect Lab 2D — Order Amplification in a Supply Chain

A four-tier supply chain — retailer, wholesaler, distributor, factory — each running a real order-up-to inventory policy on exponentially-smoothed demand forecasts. Only the retailer ever sees actual customer demand; every tier upstream reacts only to the order stream from its neighbour below. Watch a small, steady wobble in customer demand climb the chain and turn into large, delayed swings at the factory — the bullwhip effect — and see exactly how lead time, forecast smoothing and safety stock change the amplification ratio. Drag the chart to scrub back through the run's full history.