Underground Demography

April 16, 2013
Posted by Jay Livingston
Cross-posted at Sociological Images


The magic of demographic knowledge is a memorable moment in John Sayles’s 1984 movie “Brother From Another Planet.”   On the A train, a young man shows an elaborate card trick to the title alien, who looks like an African American but seems to have no understanding of the trick.  So the magician offers another.

                                                                               

From 59th St. to 125th St. is one stop on the express.  But as the movie shows, that short ride covers a large demographic change, and it’s not just racial.  The New Yorker has posted interactive graphics (here) showing the median income of the census tracts surrounding subway stations.* 

Take the A train one stop  – from the southern border of Central Park to a few blocks above its northern border – and see median income drop by $100,000. 

Many other lines travel the extremes of economic inequality.  My line is the 2. 

In the early morning commute, I see blue collar workers in their hoodies or rough jackets and steel-toe boots next to well-dressed people reading The Wall Street Journal.  They didn’t get on at the same stop.  The people who live in and work in the Wall Street census tract, which includes Park Place, are not on the train.  Here’s what their housing looks like.

And here is Franklin St., Brooklyn.

The subway demographic trick is not limited to New York. Here’s a time-lapse video of the Red Line of Chicago’s CTA.

Time-Lapse of the CTA Red Line: a 2-hour trip in 1 minute from WBEZ on Vimeo.

(If the video does not play, you can see it here.)

Despite the social class segregation in housing, in cities like New York and Chicago, people of vastly different economic circumstances are likely to share the same subway car, at least for a few stops. 

Yet I don’t get a sense of strong resentment or even envy among the have-nots (though I wish I had systematic data on this).  These cities are also where the rich are more likely to be liberal and in favor of redistributionist policies.  As Andrew Gelman has shown, the wealthy in rich states are far more liberal than the wealthy in poor states.  That may be partly because in rich states, the wealthy live in the large cities.  How strong would that effect be if we used Upstate New York, Downstate Illinois, Massachusetts outside Rte. 128, and so on?

Or to quote James Carville’s famous line about Pennsylvania: “Philadelphia in the east, Pittsburgh in the west, and Alabama in between.”

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HT: Jenn Lena for the link.