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The quality of governance of institutions, corporations and countries dependson the ability of efficient decision making within the respective boards orcabinets. Opinion formation processes within groups are size dependent. It isoften argued - as now e.g. in the discussion of the future size of the EuropeanCommission - that decision making bodies of a size beyond 20 become stronglyinefficient. We report empirical evidence that the performance of nationalgovernments declines with increasing membership and undergoes a qualitativechange in behavior at a particular group size. We use recent UNDP, World Bankand CIA data on overall government efficacy, i.e. stability, the quality ofpolicy formulation as well as human development indices of individual countriesand relate it to the country's cabinet size. We are able to understand ourfindings through a simple physical model of opinion dynamics in groups.

To how many politicians should government be left?