A simulation which runs the "Beer Game", an example of the "bullwhip" effect in supply chains with changing demand.
The chain consists of a manufacturer, distributor, wholesaler, retailer, and customer demand. Each step agents place and attempt to fulfill orders to the next piece of the supply chain.
As demand fluctuates, reactive decision-making in the model quickly demonstrates the shortcomings of decision-making with local information and no global information, as links in the chain fail to deliver, and begin to develop large backlogs and then over-compensate for them.