in some sense the treasury game can be seen as a generalisation of the wereldhandelsspel by tinbergen.
below you find version 1 of the treasury game, as played at occupy amsterdam
version 2 can be found at guts4roses.org
the treasury game is open source and can be used freely.
the treasury game can be played in many variants.
here we descibe the simple economic variant.
this game is still under construction, in particular we ask you to experiment with the values of the parameters, and please send us your feedback.
all you need to play the treasury game are:
 30 sticks
 30 gray rings
 for each player 10 rings of the same colour (different players have different colours)
 all rings should fit onto the sticks
the game is played in rounds consisting of:
 round start: the rings are given to their players
 round play: the players shove the rings onto the sticks in order to gain points
 round end: points are calculated and players with less than 20 points have to leave the game
points are calculated as follows, the value of a stick equals:
 (number of rings + the value written on the gray ring) x number of different colours.
example: a stick containing 3 red rings, 1 yellow ring and a gray ring with 2 points has value:
 (# rings + the value written on the gray ring) x # different colours =
 (3 + 1 rings + 2) x 3 different colours (red, yellow and gray) =
 6 x 3 = 18 points.
by the end of the round each player needs to have at least 20 points.
if he has less than 20 points then he is out.
if he has more than 20 points then the remainder of the points are processed as follows:
 first, a player decides from which of his sticks to take how many points, totalling 20 points
 second, for each stick the remainder of the points is divided by 10, rounded to the nearest integer and this number is written on a gray ring shoven onto the stick
finally all rings, except the gray ones, are taken from the sticks and handed back to their players to start a new round.
the above is the description of the engine of the game.
the real game emerges while adding and changing some rules during play.
this is best facilitated by an experienced game master.
rules to add include:
 there is a winner of the game, viz the player with the highest number of points
 at round end the average of all the points is calculated and for each player the difference to the average is doubled
 the game is played untill finally only one player remains
in a next part of the game groups of players, called trust circles, can cooperate and add or change any of these extra rules.
the importance of the game resides in the evaluation when switching to the next round.
many questions can be asked, such as:
 in what does this resemble our world?
 in what does it differ from our world?
 what would a trust circle in real life look like?
 what does an enlightened economy look like?
many answers are possible:
 scarsity
 ownership
 growth
 transparency
 trust
 cooperation
 money
 winner takes all...
most important is the question:
how can we model that people need to trust each other that they
 only take what they need (share)
 take all concerns into consideration
tragedy of the commons variant.
for this variant we change the way points are gained:
 players can only shove one of their rings onto a stick (multiple rings are not allowed)
 a player gains points for each stick that contains one of his rings
 the number of points he gains depends on the number of rings present on the stick, as follows:
number of rings on stick

number of points per player

1 
1 
2 
2 
3 
3 
4 
2 
5 
1 
example: if 1 stick holds 4 rings (so by 4 different players) then each of these players gaines 2 points.
a better way of implementing the tragedy of the commons into the treasury game is the following:
all sticks used for gaining points are taken from the game and at the start of each round some of these sticks are placed back into the game depending on the number of remaining (unused) sticks. as yet i still have to calculate a viable parametrisation depending on the number of players. the number of sticks used in the game (30) is the natural equilibrium. the easiest parametrisation is: the number of unused sticks is doubled, which means that the group should never process more than half of the available sticks.
the treasury game is designed with the following interpretation in mind:
 players represent economic actors
 rounds represent years
 sticks represent finite resources (global commons) like land and minerals, but also in processed form as (semifinished) products
 rings represent infinite resources like labour and energy
 shoving rings onto sticks represents production
 several colours on a stick represent cooperation
 the threshold of 20 points represents the necessities of life
 leaving the game represents dying