手法を比較

	Common-Pool Resource Analysis	Median Voter Model
分野	Political Economy	Political Economy
系統	MCDM	MCDM
提唱年	1990	1948
提唱者	Garrett Hardin & Elinor Ostrom	Duncan Black & Anthony Downs
種類	Institutional analysis framework for shared resources	Formal model of electoral competition
原典	Ostrom, E. (1990). Governing the Commons: The Evolution of Institutions for Collective Action. Cambridge University Press. ISBN: 9780521405997	Black, D. (1948). On the Rationale of Group Decision-making. Journal of Political Economy, 56(1), 23-34.
別名	Commons Governance Analysis, Ostrom Design Principles, Tragedy of the Commons Analysis, CPR Analysis	Median Voter Theorem, Black's Median Voter Theorem, Downsian Median Voter Model, Median Voter Equilibrium
関連	4	4
概要	Common-pool resource (CPR) analysis is a framework for diagnosing why shared natural and man-made resources are prone to overuse and for identifying the institutional conditions under which user communities can govern them sustainably without privatization or top-down state control. A common-pool resource is rivalrous (one user's consumption subtracts from what is available to others) yet costly to exclude users from. Garrett Hardin's 1968 'tragedy of the commons' framed the pessimistic baseline in which rational appropriators collectively destroy the resource, while Elinor Ostrom's 1990 Governing the Commons established, through extensive empirical work, eight design principles that distinguish durable self-governing commons from those that collapse.	The median voter model is a foundational result of political economy stating that, under majority rule with voters whose preferences are single-peaked on a single policy dimension, the ideal point of the median voter is the Condorcet winner — it cannot be beaten by any other alternative in pairwise majority voting. Duncan Black established the theorem formally in 1948, and Anthony Downs extended it in 1957 into a theory of party competition in which two vote-maximizing parties converge to the median voter's preferred policy. The model is the workhorse linking the distribution of citizen preferences to equilibrium policy outcomes in democracies.