People who live in declining areas are more likely to have been born nearby, which implies that they have idiosyncratic ties to where they live. Labor demand shocks to places where people have higher levels of these local ties, proxied by their birth places, lead to less migration and larger movements into and out of the labor market. A model of spatial equilibrium that includes a distribution of workers' preferences for living in their birth places matches these facts and suggests further implications. Declines in local productivity lead to lower migration elasticities and larger declines in real wages after further declines in productivity. Population can take generations to adjust, since ties can only be reallocated slowly. Across a wide class of models, lower migration elasticities make subsidies to local areas more efficient, since they change fewer people's locations. Local subsidies are more efficient in declining areas, where they are the most common.Keywords: Migration, Local Labor Markets, Demography, Growth, Decline JEL Numbers: J61, R23, E62, R58, H31, D61, J11 * University of Michigan Department of Economics, zabek@umich.edu. I owe particular thanks to my advisors, Dominick Bartelme, John Bound, Joshua Hausman, and Matthew Shapiro, for patience, perspective, knowledge, and encouragement. Helpful comments from a number of people were also invaluable. These people include, but are not limited to: Aditya Aladangady, Martha Bailey, C. Hoyt Bleakley, Lawrence Blume, Charles Brown, Patrick Coate, Ben Farber, Pamela Giustinelli, David Green, Chris House, Pawel Krolikowski, John Laitner, David Lam, Andrei Levchenko, Corinne Low, Jessica Ott, Linda Tesar, Michel Serafinelli, Robert Schoeni, Christopher Smith, Melvin Stephens, Bryan Stuart, Robert Willis, Abigail Wozniak, and seminar participants at the University of Michigan, the University of Pennsylvania SSPF, H2D2 research day at the University of Michigan, the Population Association of America, the Midwest Economics Association, the Midwest Macro Association, the Urban Economics Association, the US Census Bureau, the 2017 SOLE meetings, the Barcelona GSB Summer Forum, The Federal Reserve Bank of Cleveland, Cleveland State University, the Upjonh Institute, the SPP1764 conference at the German Bundesagentur fr Arbeit, and several potential employers. I am grateful to David Dorn for sharing data and code both via his website and through personal correspondence. The research was supported in part by NICHD center grant (R24 HD041028) to the Population Studies Center at the University of Michigan and through computational resources and services provided by Advanced Research Computing at the University of Michigan. Earlier versions of this paper circulated as "Population growth, decline, and shocks to local labor markets" and "Implications of local ties in spatial equilibrium."In spatial equilibrium, the marginal person will be equally well off, no matter where she lives (Rosen (1979) and Roback (1982)). Most people are not marginal, however. Kennan and...