NIMBY means Not In My Backyard. In other words, build stuff all you want as long as you don't do it near me, where it will bring traffic and crowds in its wake.
It's a powerful force, but over the past couple of decades a counterforce has been steadily growing that blames NIMBY for slow growth and high living costs in big American cities. It is, naturally, called YIMBY, for Yes In My Backyard. A couple of nights ago it seemed like it finally got its big breakthrough when Barack Obama endorsed it in primetime at the DNC. Kamala Harris is also a fan.
Robert Kwasny tweeted about this yesterday and Alex Tabarrok picked up the theme today:
Kwasny also wonders why Democrats seem to have picked up YIMBY more than Republicans, especially given that deregulation, anti-zoning, pro-growth, pro-developers would seem more compatible with Republican rhetoric and political support.
It's worse than that. It's not just that Republicans haven't "picked up YIMBY." Republicans are absolutely dead set against it.
To understand why, you have to look past the intellectual roots of YIMBYism among libertarians and instead look further back to the original political roots of NIMBYism. It's a movement that unquestionably started in the suburbs, and suburbia has historically been a Republican stronghold. These folks moved to the suburbs for a reason: they liked living in an uncrowded, single-family sprawl. They decidedly didn't want city life sneaking back into their peaceful, grassy neighborhoods where they get to own their own homes instead of renting a few rooms from a landlord.
Democrats, by contrast, have recently become more open to YIMBYism because they have political roots among the young, who push YIMBYism—largely in the form of opposing regulations that restrict new housing—as a solution for high housing prices in cities. These new urbanists also promote greenfield development in suburbs, but their big focus is on infill development in cities.
For Democrats, this is a bit of a balancing act, but for Republicans it's not. They don't care about young people in cities but they care very much about middle-aged families in suburbia. So it's easy for them to oppose anything that has even a chance of ruining paradise.
And they have. Republicans in recent years have relentlessly accused Democrats of wanting to squash everyone into crowded apartment buildings in cities. They make conspiracy theories out of things like Agenda 21, a milquetoast UN program for sustainable development. They oppose bike lanes and trains and mass transit because suburbanites all drive cars.
None of this has to do with ideology or attitudes toward regulation on either side. It's based purely on the demands of each party's political base. This has moved Democrats cautiously in the direction of YIMBYism (cautiously because plenty of Democrats are suburbanites) and Republicans firmly in the direction of opposition.
In the end, most of the second-order arguments for YIMBYism (density is good for the economy, density is good for the climate, density is good for social interaction, etc.) are meaningless. There's only one argument that matters: housing is too expensive in desirable American cities and lots of young people voters believe we need to build way more in order to get the price down. Even now, this is almost universally opposed by people who actually live in cities, so it all boils down to one thing: Who gets to decide? Should the people who live in a neighborhood have the biggest say about what gets built? Or should it be the outsiders who want to move into the neighborhood?
That's a very pretty question, actually, and there's no clear answer. It's pretty obvious what the arguments are on each side, and equally obvious that both sides have legitimate stakes.
Barack Obama aside, I'm skeptical that the Democratic Party is really willing to spend a lot of political capital on YIMBYism. As an applause line it's fine. But in the real world it's primarily a local issue, not a national one, and local Democrats want to get reelected as much as anyone else. Even in California, which has by far the worst housing problem in the country, YIMBY legislation has come slowly and painfully, and it's been fought tooth and nail at every step. So far, even with legislation, YIMBY has had very little real-world impact yet. There's just too much opposition to it.
POSTSCRIPT: On a related note, YIMBYism has had its biggest concrete successes in the fight against homelessness. Los Angeles in particular has passed bond measures, thrown up agencies with thousands of workers, and spent billions and billions of dollars on it. And yet, even so it's nearly impossible to build homeless shelters. Why? Not because of money or lack of political will. Because of NIMBY. That's how strong it is.