Beer distribution game

Beer Game

An example of players at a game board.
Players	Multiple teams with a minimum of 4 players
Age range	Recommended for graduate students and members of the business management community.
Setup time	10-20 minutes
Playing time	60-90 minutes plus another 60-90 minutes for debriefing
Random chance	None

The beer distribution game (also known as the beer game) is an experiential learning business simulation game created by a group of professors at MIT Sloan School of Management in early 1960s to demonstrate a number of key principles of supply chain management. The game is played by teams of at least four players, often in heated competition, and takes at least one hour to complete. A debriefing session of roughly equivalent length typically follows to review the results of each team and discuss the lessons involved.

The purpose of the game is to understand the distribution side dynamics of a multi-echelon supply chain used to distribute a single item, in this case, cases of beer.

The object of the game is to meet customer demand for cases of beer through the distribution side of a multi-stage supply chain with minimal expenditure on back orders and inventory. There are four stages, manufacturer, distributor, supplier, retailer, with a two week communication gap of orders toward the upstream and a two week supply chain delay of product towards the downstream. There is a one-point cost for holding excess inventory and a one-point cost for any backlog (old backlog + orders - current inventory). In the board game version, players cannot see anything other than what is communicated to them through pieces of paper with numbers written on them, signifying orders or product. The retailer draws from a deck of cards for what the customer demands, and the manufacturer places an order which, in turn, becomes product in four weeks.

Verbal communication between players is against the rules so feelings of confusion and disappointment are common. Players look to one another within their supply chain frantically trying to figure out where things are going wrong. Most of the players feel frustrated because they are not getting the results they want. Players wonder whether someone in their team did not understand the game or assume customer demand is following a very erratic pattern as backlogs mount and/or massive inventories accumulate. During the debriefing, it is explained that these feelings are common and that reactions based on these feelings within supply chains create the bullwhip effect.

The game is used to illustrate one of the links between System Dynamics theory and the Feedback Control Theory which inspired it - that systems with positive feedback loops and high gain can lead to oscillation and overload, such as that which happens with microphones and amplifiers.