Increased aggression during human group contests when competitive ability is more similar

From Stulp G, Kordsmeyer T, Buunk AP, Verhulst S.: Theoretical analyses and empirical studies have revealed that conflict escalation is more likely when individuals are more similar in resource-holding potential (RHP). Conflicts can also occur between groups, but it is unknown whether conflicts also escalate more when groups are more similar in RHP. We tested [...]