Average percentage of endowments contributed to the group by high- and low-ranking participants in Study 1 at different perceived probabilities of group failure.

<p>Contributions increased as perceived threats increased (<i>b</i> = 0.31, <i>z</i> = 15.5, <i>p</i><.001). High-ranking participants contributed a lower percent of their endowment than did low-ranking participants (<i>b</i> = −3.70, <i>z</i> = −2.20, <i>p</i> = .028).