1 Imitation-driven Cultural Collapse a,* a,* 2 Salva Duran-Nebreda and Sergi Valverde a 3 Evolution of Technology Lab, Institute of Evolutionary Biology (UPF-CSIC), Passeig de la Barceloneta, E-08003, 4 Barcelona. * 5
[email protected];
[email protected] 6 ABSTRACT A unique feature of human society is its ever-increasing diversity and complexity. Although individuals can generate meaningful variation, they can never create the whole cultural and technological knowledge sustaining a society on their own. Instead, social transmission of innovations accounts for most of the accumulated human knowledge. The natural cycle of cumulative culture entails fluctuations in the diversity of artifacts and behaviours, with sudden declines unfolding in particular domains. Cultural collapses have been attributed to exogenous causes. Here, we define a theoretical framework to explain endogenous cultural collapses, driven by an exploration-reinforcement imbalance. This is demonstrated by the historical market crash of the 7 Atari Video Console System in 1983, the cryptocurrency crash of 2018 and the production of memes in online communities. We identify universal features of endogenous cultural collapses operating at different scales, including changes in the distribution of component usage, higher compressibility of the cultural history, marked decreases in complexity and the boom-and-bust dynamics of diversity. The loss of information is robust and independent of specific system details. Our framework suggests how future endogenous collapses can be mitigated by stronger self-policing, reduced costs to innovation and increased transparency of cost-benefit trade-offs. 8 Introduction 9 Comparative studies between humans and other animals emphasize the unique aspects of human learning, including their 1,2 10 capacity for high-fidelity copying .