You'll be in groups of 4 and play 4 rounds. In each round, you are randomly matched with another participant and bargain over how to split 100 points. At the start of each round, the computer randomly assigns you an outside option between 0 and 100.
Both players submit one number to the mechanism. If a1 + a2 <= 100, the mechanism makes the usual recommendation using A1 = a1 + (100 - a1 - a2) / 2 and A2 = a2 + (100 - a1 - a2) / 2.
If a1 + a2 > 100, an algorithm may in exceptional cases suggest a different settlement, including one below a player's stated amount.
Both players then decide simultaneously whether to accept or reject the final suggestion. You have 60 seconds to submit your number and 30 seconds to accept or reject.
Earnings are calculated based on the number of points you agree on:
If agreement is reached: Earnings = number of points you receive in the agreement.
If no agreement is reached: Earnings = your outside option.
One round will be randomly selected for payment at the end. Each ECU earned equals 0.03 pounds.