Income Growth and the Distributional Effects of Urban Spatial Sorting
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Urban income study: Downtown housing costs driven by top earner influx; welfare gap btw 90th/10th percentiles widened 18% points (1990-2013). Higher-income residents’ spatial preferences amplify inequality

new Hurst's NBER, low skilled workers are unable to pass though to employers an uptick in housing prices and are thus worse off after rents
"....In order to explore the link between rising incomes at the top of the income distribution and urban gentrification, we write down a spatial model of a city with heterogeneous agents and nonhomothetic preferences. We quantify the model using detailed location and income data, at the tract level, on the the top 100 CBSA's in the US. We then use the quantified model to tease out how much of the change in spatial sorting over time can be plausibly traced back to changes in the income distribution, tilted towards higher incomes. In the model, as the rich get richer, their increased demand for urban amenities drives up housing prices in downtown areas, where the development of these amenities is fueled by economies of density.The poor are either displaced or end up paying higher rents, making them worse off.Our preliminary estimates suggest that increases in the incomes of high income individuals was a substantive contributor to increased urban neighborhood change during the last 25 years within the U.S. and that the neighborhood change resulting from the increased incomes of the rich did, in fact, make poorer residents worse off. We explore possible policy responses to the rise in gentrification,and find that policies that contain gentrification seem to only lead to a very modest mitigation of the increase in well-being inequality, which could arguably be targeted more efficiently by direct redistribution....One of the paper's main findings is that, because of externalities imposed by the in-migration of the rich, welfare estimates of increased income inequality are understated when spatial sorting responses are ignored. Preliminary estimates suggest that welfare differences between those at the 90th percentile of the income distribution and those at the 10th percentile of the income distribution increased by an additional 2.3 percentage points once accounting for the changing nature of spatial sorting of the rich into downtown urban areas during the 1990 to 2013 period. As way of comparison, in our sample of large cities, the measured income gap between the 10th and 90th percentiles of the income distribution increased by about 18 percentage points during this time period. Moreover, we are finding that the resulting neighborhood change within downtown areas in response to the rising incomes of the rich reduced the well-being of those at the 10th percentile of the income distribution by about 2.5 percent, in consumption equivalent terms....In particular, as the rich got richer, they moved into downtown urban areas making the poor worse off.The welfare for households at the 90th percentile of the income distribution is essentially unchanged from the associated spatial sorting response. In particular, their welfare only fell by -0.25 percentage points. As they move into downtown areas, amenities which they value endogenously respond making them better off. House prices increase making them slightly worse. These two effects roughly cancel out for higher income households. Households at the 10th percentile of the income distribution, however, are made worse off in absolute terms. Specifically, households at the 10th percentile have 2.6 percentage points lower utility from the movement of higher income individuals into urban areas as a response to their rising incomes. Their rents are increasing downtown and while amenities are increasing, they do not value those amenities as much..."
Victor Couture, Cecile Gaubert, Jessie Handbury and Erik Hurst, "Income Growth and the Distributional Effects of Urban Spatial Sorting," October 19, 20919, National Bureau of Economic Research, August 2019, https://www.nber.org/papers/w26142


















Ed Comment:Add how the pandemic broke the valley’s hold on tech jobs. I think this will accelerate something I fear—the offshoring of tech jobs abroad, especially the most technical jobs. That’s going to lead to the more entrepreneurialism abroad or the most valuable kind. The more our tech giants can zoom in the talent and breakthrough, the less they will care about US working. There will be tech hubs in every country attracting their best talent.