“…For example, see Blau and Ferber (1991), Groshen (1991), Light and Ureta (1990), Paglin and Rufolo (1990), Orazem, Mattila, and Yu (1990), Sorenson (1989), Gronau (1988), Gyourko and Tracy (1988), Lindsay and Maloney (1988), Blau and Belier (1988), Robinson and Tomes (1984), Baugh and Stone (1982), Duncan and Leigh (1980), Corcoran and Duncan (1979), Smith (1976Smith ( , 1977, Polachek (1975), Blineder (1973), and Oaxaca (1973. 2.…”