Signals play a particularly important role within organisms and among individuals of highly cooperative species. Because in both these cases there is little or no conflict of interest, signals should be as cheap as possible while still maintaining reliability. Cheap signaling systems enhance the efficiency of the organism or cooperative system but they are also more easily subverted by exploitative agents (Markl 1985), such as pathogens or politicians.
( Peter Hammerstein et al. (2006). Robustness: A Key to Evolutionary Design. Biological Theory. )
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