EvoLudoLab: 2x2 Game - Dominance B

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Along the bottom of the applet there are several buttons to control the execution and the speed of the simulations - for details see the EvoLudo GUI documentation. Of particular importance are the parameters button and the data views pop-up list along the top. The former opens a panel that allows to set and change various parameters concerning the game as well as the population structure, while the latter displays the simulation data in different ways.

Color code: Cooperators Defectors
New cooperator New defector
Payoff code: Low High

Note: The shades of grey of the payoff scale are augmented by blueish and reddish shades indicating payoffs for mutual cooperation and defection, respectively.

Type B dominates

Irrespective of the initial configuration, type \(B\) players steadily increase and eventually take over the entire population.

In the context of cooperation, this scenario is captured by the Prisoner's Dilemma: Defection is the better option regardless of the co-player's decision. However, as a consequence both players end up with the punishment payoff \(P\) instead of the more favorable reward \(R\) for mutual cooperation. This generates a conflict of interest between the individual and the group (in this case the pair of interacting players). In the absence of any additional mechanisms such as repeated interactions, spatial extension, structured populations etc. cooperative behavior is bound to go extinct.

The applet above has \(R = 1, P = 0, T = 1.16\) and \(S = -0.16\) with players imitating better strategies proportional to the payoff difference. The population size is 10'000 and the initial fraction of cooperators 99%.

Data views

Strategies - Structure

Snapshot of the spatial arrangement of strategies.

Strategies - Mean

Time evolution of the strategy frequencies.

Fitness - Structure

Snapshot of the spatial distribution of payoffs.

Fitness - Mean

Time evolution of average population payoff bounded by the minimum and maximum individual payoff.

Fitness - Histogram

Snapshot of payoff distribution in population.

Structure - Degree

Degree distribution in structured populations.

Console log

Message log from engine.

Game parameters

The list below describes only the few parameters related to the Prisoner's Dilemma, Snowdrift and Hawk-Dove games. Follow the link for a complete list and detailed descriptions of the user interface and further parameters such as spatial arrangements or update rules on the player and population level.

Reward
reward for mutual cooperation.
Temptation
temptation to defect, i.e. payoff the defector gets when matched with a cooperator. Without loss of generality two out of the four traditional payoff values \(R, S, T\) and \(P\) can be fixed and set conveniently to \(R = 1\) and \(P = 0\). This means mutual cooperation pays \(1\) and mutual defection zero. For example for the prisoner's dilemma \(T > R > P > S\) must hold, i.e. \(T > 1\) and \(S < 0\).
Sucker
sucker's payoff which denotes the payoff the cooperator gets when matched with a defector.
Punishment
punishment for mutual defection.
Init Coop, init defect
initial fractions of cooperators and defectors. If they do not add up to 100%, the values will be scaled accordingly. Setting the fraction of cooperators to 100% and of defectors to zero, then the lattice is initialized with a symmetrical configuration suitable for observing evolutionary kaleidoscopes.