Illustrative NetLogo model contrasting direct reciprocity, indirect reciprocity, and a "money mechanism" in the context of repeated helping games.
Main model file: money-reciprocity 3.0.nlogo Specific comparison between replicated Nowak (1998) image scoring model and the Bigoni, Camera & Casari (2020) tokens/indexes: money-reciprocity 3.0 - balances and image scores