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Social loafing is the reduction in motivation and effort when individuals work collectively compared with when they work individually or coactively. Latane, Williams, and Harkins (1979) even suggested that social loafing is a type of social disease, having "negative consequences for individuals, social institutions, and societies".
Karau, S. J., & Williams, K. D. (1993). Social loafing: A meta-analytic review and theoretical integration. Journal of personality and social psychology, 65(4), 681.