Head, John GShoup, Carl S2018-07-122018-07-121969-09John G. Head and Carl S. Shoup, “Public Goods, Private Goods and Ambiguous Goods,” The Economic Journal, Vol. 79, No. 315, pp. 567–572. September 1969,http://hdl.handle.net/10222/73994Public Goods, Private Goods and Ambiguous GoodsArticle