The Composite Model for research "How risky is it to visit a supermarket during the pandemic?", PLoS One, 2021 by Alexey Tsukanov, Alexandra Senjkevich, Maxim Fedorov and Nikolai Brilliantov (2020-2021) C++ source file(s) and the results of numerical simulations using this composite model (composed of the social force, purchasing strategy and infection transmission models) to investigate the infection spread in a supermarket during a pandemic. DO NOT FORGET TO CITE our article "How risky is it to visit a supermarket during the pandemic?", PLoS One (2021). DOI: 10.1371/journal.pone.0253835 https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0253835#sec018