“…However, alternative specifications have been explored. See Appendix C. Other measures of city similarity are generally consistent with the types of controls in the quality of life and migration literature, which control for differences in distance (Davies et al, 2001), coastline (Blomquist et al, 1988;Gyourko and Tracy, 1991), age (Gabriel et al, 2003;Kennan and Walker, 2010a), education (Costa and Kahn, 2000;Chen and Rosenthal, 2008), house value/housing expenditures (Gyourko and Tracy, 1991;Kennan and Walker, 2010a), per capita income (Davies et al, 2001), and population density (Whisler et al, 2008). 26 There are seven categories for age (0-17, 18-24, 25-34, 35-44, 45-54, 55- 27 There are several reasons to prefer home price correlation to other priced-based measures such as wage or rent correlations.…”