Summary

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], then player 1 is offered [A1 = a1 + (100 - a1 - a2) / 2], player 2 is offered [A2 = a2 + (100 - a1 - a2) / 2].
If [a1 + a2 > 100], then mechanism suggests breakdown of bargaining.

If a recommendation is made, both players decide simultaneously whether to accept or reject it.

You have 60 seconds to submit your number and 30 seconds to accept or reject the recommendation.

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.