V1-2.08| THE LOOP
QQ: What happens to a place when the people living there decide it is safer to stay inside?
AA: Each of them is right, and together they are ruined. The street empties, the shops close, the groups that held the place together die — and the emptier it gets, the more dangerous it is, which makes staying inside even more sensible than it was yesterday.
01| Begin with a decision so ordinary nobody calls it one. There is a corner where things happen. You stop walking past it. You take the long way. Nothing happened to you; you simply rerouted your life by two hundred metres and did not think about it again.
02| Everybody does this. Research on fear of crime finds that around two thirds of adults have given up at least one activity because of it, and about a third avoid certain parts of their own town. It has names in the literature — "constrained behaviours," and when it goes further, "precautionary social isolation," which means staying home so nothing can happen to you.
03| Watch what the rerouting costs. A World Bank study of college students in Delhi found that women chose colleges in the bottom half of the quality ranking over ones in the top fifth, in order to feel safer on the journey. Men with the same choices did not. Nobody took those places away from them. They handed them back, in exchange for a safer bus ride. The route, not the destination, set the ceiling on their lives.
04| The same thing happens to hours. A road that is unsafe after dark is not a road at night, and that removes exactly the end of the day where evening shifts, second jobs and night classes live. The complaint is rarely "there is no work." It is "there is no work I can safely reach at the hour it runs."
05| And the place you were travelling to fails too. In Rio de Janeiro's favelas, researchers matched gunfights between drug gangs against school results, and found scores fell in the years a school was exposed. The reason is not the child:
"Gunfights are associated with higher teacher absenteeism, principal turnover, and temporary school closings."— Monteiro & Rocha, Drug Battles and School Achievement: Evidence from Rio de Janeiro's Favelas, Review of Economics and Statistics 99(2), 2017, p. 213
The teacher does not come. The head leaves. The building shuts for the day. Afterwards it is written down as the child falling behind.
06| Even the children who go every day pay. In Chicago, Patrick Sharkey tested children before and after a killing on their own block. A homicide in the previous week pushed their reading and vocabulary scores down by about half a standard deviation — enough to move a child from the middle of the class to near the bottom, for a week. Nobody moved house. No family income changed. The street changed, and the score changed with it. The same study found no such effect among Hispanic children in the same data, and nobody knows why, which is worth saying out loud rather than hiding.
07| Then the money goes. Sandra Rozo studied Colombian factories, using a national security push to separate cause from coincidence. Firms in more violent places cut production, and some shut completely. Workers' real incomes fell. Violence does not merely frighten a neighbourhood. It removes the wages from it.
08| And then the groups go, which is the loop closing. Sharkey and colleagues asked the reverse question: what if you add community organisations? They found the effect is causal — roughly every ten extra community organisations per hundred thousand residents produced a nine percent fall in the murder rate. An organisation is nothing more exotic than people meeting regularly for a purpose. Add them and killing falls. Take them away and the machine runs backwards.
09| Which is why this particular loss is the expensive one. What holds a neighbourhood together has a definition, and it has two halves:
"social cohesion among neighbors combined with their willingness to intervene on behalf of the common good"— Sampson, Raudenbush & Earls, Neighborhoods and Violent Crime: A Multilevel Study of Collective Efficacy, Science 277, 1997, p. 918
Warmth, and the willingness to step in. A barrio can be high on the first and near zero on the second — people who know each other, feed each other's children, and still say nothing when a man beats his wife or a boy takes another boy's shoes. It is not that there is no community. It is that the community has warmth and no authority.
10| And both halves need people standing in the same place, on purpose, more than once. That is the raw material regulation is made of, and withdrawal removes exactly it. A barrio can lose the ability to organise itself long before it loses population or income, and no census records the loss.
11| One thing must be admitted. The two ends of this chain are proven — people avoid places, and violence closes businesses and organisations. The middle is not. I have found no study that counts how many people stopped using a street and then measures what became of the street. Everybody assumes it. Nobody has measured it, and that gap belongs in print rather than under it.
12| What is not in doubt is that the behaviour is universal. Withdrawal is not a habit of poor neighbourhoods. It is what any human does when a place turns dangerous. Nobody has to be taught it and nobody chooses it. Staying home is right for me, right for my neighbour, and when everybody is right at the same time the street empties, the shops go, the groups die, and the place gets worse — which makes staying home righter than before. The barrio is not special in this. It differs only in that the danger never lets up long enough for anyone to come back out.
