(1) Normative Claim
(2) Descriptive Claim
(3) Attitudinal Claim
- - - - -
Hardin (sp?)
(1) Tragedy of Commons. discussion re: field hypo. can also characterize as externality.
(2) Prisoners' Dilemma
(3) Logic of Collective Action.
(4) Public Goods
(5) Externalities