→公共財のマトリクス×公共財概念の細分化の歴史×排除性×競合性×財の4類型×公共財×paul_a._samuelson×the_pure_theory_of_public_expenditure×クラブ財×james_m._buchanan×an_economic_theory_of_clubs×コモンプール資源×elinor_ostrom×Governing the Commons×public_goods_and_public_choices×samuelson_(1954)×musgrave_(1959)×buchanan_(1965)×samuelson×buchanan×ostrom→