Agent Based Model of Common Good Production in a residential complex

Main components of the model

Agents: represent households in a residential complex. There are three types of agents:

Sponger: agents who don’t pay their share for producing and maintenance the common good.
Conformist: agents who most of them pay for producing and maintenance of the common good.
Sacrifiers: agents who not only pay their share for production and maintenance of the common good but pay even more to make up others’ free-riding.

Actions

Agent’s strategies: each agent has a couple of strategies to act based on:

Spongers’ strategies:

Cheating: all Spongers who are able to defect, may do it. Each sponger has a probability of 80% for defecting and 20% for cooperation.
Robbery: defector spongers with this strategy not only don’t pay their contribution in common good but also take from others benefits. In this case the sum of all contributions is divided among defector spongers.
Vandalism: defector spongers not only don’t pay their contribution for common good production but also destruct part of it. In this case half of sum of all contributions is destructed by defector spongers.

Conformists’ strategies:

Abiding: Conformists often obey norms. Each conformist has a probability of 80% for cooperation and 80% for defecting.

Sacrifiers strategies:

Collaboration: all sacrifiers who are able to pay their share for producing and maintaining common good, do it.
Dedicating: Sacrifiers compensate spongers defections, if they are able to. In this case at first those total amount of defection is calculated then it is equally among capable sacrifiers to make it up.
Punishing: Sacrifiers not only collaborate totally, but also pay for punishing defector. To estimate punishment cost, the number of sacrifiers with more than 1 unit asset is multiplied by 2 and then divided by the number of defectors. The punishment amount is subtracted from defectors asset.