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Multiagent Systems

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of. Dr. Jürgen Dix · Department of Informatics, TUC <strong>Multiagent</strong> <strong>Systems</strong>, WS 06/07 181/731<br />

3. Decision Making (1) 1. Evaluation Criteria<br />

We need to compare protocols. Each such protocol leads<br />

to a solution. So we determine how good these solutions<br />

are.<br />

Social Welfare: Sum of all utilities<br />

Pareto Efficiency: A solution x is Pareto-optimal, if<br />

there is no solution x ′ with:<br />

(1) ∃ agent ag : ut ag (x x ′ ) > ut ag (x)<br />

(2) ∀ agents ag ′ : ut ag ′(x′<br />

x ′ ) ≥ ut ag ′(x).<br />

Individual rational: if the payoff is higher than not<br />

participating at all.

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