Supplementary Material Supplementary Notes Wager-Probability Relationship under Prospect and Expected Utility Theories The Supplementary Material includes the following: We show that the wager is a convex function of the subjective probability in a binary gamble in which one can wager any part of an initial bonus as in our experiment. We denote the bonus by w$_{0}$ and the wager by w . If the bet is successful, then one S1 • Supplementary Notes – Wager-Probability Relationship under Prospect and Expected Utility The- ories – Quantitative Testing of Alternative Models • Supplementary Methods: Weekly Pre-Survey • Supplementary Tables – Table S1: Average communication rates for chain and complete networks – Table S2: NFL games used in experiment – Table S3: Discussion participant demographics – Table S4: Nonparametric testing of experimental data