@article {GarciaCamilo2021Cpag,
	title = {Cooperative play and globalized social change: Mexican children are less cooperative in 2017 than in 1967},
	journal = {Current Research in Ecological and Social Psychology},
	volume = {2},
	year = {2021},
	publisher = {Elsevier B.V},
	abstract = {{\textbullet}Mexican children{\textquoteright}s cooperative behavior was studied with Madsen{\textquoteright}s cooperation board.{\textbullet}Both urban and rural children were less cooperative in 2017 than in 1967.{\textbullet}The behavior change was an adaptation to ecological change in several areas:{\textbullet}Population, economic resources, technology, and schooling all increased.{\textbullet}In world crisis, cooperation is indispensable for human survival \&amp; must be promoted. Greenfield{\textquoteright}s theory of social change and human development is based on the distinction between Gemeinschaft (low-income agricultural communities with low levels of formal education and technology) and Gesellschaft (wealthier commerce-based societies with high levels of formal education and technology). Cooperation is more adaptive in a Gemeischaft environment; in contrast, competition is more adaptive in a Gesellschaft environment. As Mexican ecologies moved in the Gesellschaft direction over recent decades, children{\textquoteright}s cooperative behavior declined, as predicted by the theory. The current quasi-experiment extends this finding from a two-person game, the marble pull, to a new situation, Madsen{\textquoteright}s cooperation board, a game that requires cooperation among four children. Based on a sample of 57 groups of four children each tested in 2017 and 70 groups of four children each tested in 1967, the Wilcoxon Signed Ranks Test (p\&nbsp;\&lt;\&nbsp;0.001) showed that the decline of cooperation and the rise of competition generalizes across middle-class urban, low-income urban, and rural children in Mexico and that it applies to male, female, and mixed groups. In conclusion, we provide continuing evidence that child behavior is responsive to ecological conditions and shifts over time in order to adapt to them. Given that cooperation is a fundamental human trait that binds social units together, our study also contributes to the conclusion that globalized social change in the Gesellschaft direction entails human loss as well as gain. [Display omitted]},
	keywords = {Child Development, Competition, cooperation, Culture, Mexico, SOCIAL change, Social development},
	issn = {2666-6227},
	author = {Garcia, Camilo and Greenfield, Patricia M and Navarro-Hern{\'a}ndez, Axel M and Colorado-Garc{\'\i}a, Jannethe and Vida{\~n}a-Rivera, Tania Mar{\'\i}a}
}
