In other words, all of the world’s citizens and countries benefit from it, regardless of whether they contribute to supplying it. Given this, free riders (those who enjoy the benefits of the good without investing in its provision) are likely to be plentiful.
马德里—全球安全——没有冲突的安全和平环境——是一种公共品。换句话说，全世界所有公民和国家都能从中获益，不管你是否出力供应了它。因此，免费搭车者（享受了公共品好处但并没有投资于公共品供给的人）可能会有很多。但是，当事关全球稳定时，世界无法负担免费搭车的欧洲。