Fig. 1. Influences on volunteer irrigation labor (workdays). LEFT: Negative binomial model predictions of the effect of CASTES show that increasing caste diversity decreases estimated cooperative labor dramatically, whether individuals have CHANNEL access or are Dalit. RIGHT: Estimates of the effects of demographic dominance (FRAC) on workdays shows that increasing ego-centric caste homogenetiy increases willingness to contribute to the upkeep of the irrigation system. The term Dalit refers to the servant groups also termed Harijan, untouchable, or Scheduled Caste/Tribe.