초록 없음 Frank, R. H. (1985). The demand for unobservable and other nonpositional goods. The American Economic Review, 75(1), 101-116. https://www.jstor.org/stable/1812706
happinesssnu
초록 없음 Frank, R. H. (1985). The demand for unobservable and other nonpositional goods. The American Economic Review, 75(1), 101-116. https://www.jstor.org/stable/1812706