In this game, participants engage in a continuous double auction to trade oranges. They are divided into buyers and sellers, and subsequently can submit bids and asks based on their own values and costs, respectively. A transaction occurs when the highest bid matches the lowest ask or when a participant simply accepts to buy or sell at the best ask or bid available from the other side of the market.
This game teaches participants about gains from trade and how supply and demand interact. They learn how to trade and discover when and why price and quantity converge to the competitive equilibrium level. It can be used to further explore effects of market interventions such as price controls, taxes, and subsidies on the market.