Effects of independent variables on manipulation and contributions in Study 3.

a0 = low rank, 1 = high rank.b0 = Baseline condition, 1 = Extra Power condition.cPerceived threats are not included in the manipulations analysis because participants made decisions about manipulating perceived threats before threat levels were announced.dThere were 40 rounds (20 in Baseline condition and 20 in Extra Power condition with order counterbalanced).Multilevel model of percents of endowment (and standard errors of the coefficients) spent on increasing the threat level (columns 1–2) and contributing to the group (column 3) in Study 3. Numbers represent the effect of a one unit change in the independent variables on the percent of endowment spent on manipulation or contribution. Each model is based on 4,320 observations (108 participants across 40 rounds).+p*p**p