Where does broken windows collide?

In criminology, broken windows names the theory that visible signs of disorder, such as broken windows, graffiti, and litter, signal that no one is minding a place, and that this signal invites more disorder and eventually more serious crime. Wilson and Kelling set it out in their 1982 essay Broken Windows, suggesting that attending to small signs of neglect and maintaining public order might keep neighborhoods from sliding into decline, a logic often tied to order-maintenance or quality-of-life policing. The empirical evidence for the theory is contested. Sampson and Raudenbush's 1999 study observed disorder directly on city streets and reported that both disorder and crime were largely explained by neighborhood structure and collective efficacy, casting doubt on a direct causal path from disorder to crime. The referent is a claim about how the appearance of a place relates to crime, not a lesson in economics and not a controlled test of contagion.[1][3]

Unit

A place's level of visible disorder and its proposed link to crime

Recovery means

Repairing and maintaining order is proposed to reverse the signal, though whether that lowers crime is disputed

Measured by

Assessed by observing physical and social disorder on streets and relating it to recorded crime and neighborhood traits

In economics, the broken-window fallacy is the error of counting the money spent repairing a broken window as a gain to the economy while ignoring what that money would otherwise have bought. Bastiat told the parable in his 1850 essay That Which Is Seen, and That Which Is Not Seen: a shopkeeper's broken pane keeps the glazier busy, and an onlooker calls this good for trade, but the shopkeeper has simply lost the shoes or book he would have bought instead. The point is opportunity cost, the seen spending set against the unseen alternative uses that were given up. The window here is a device for teaching that destruction is not wealth, and it carries no claim about crime, policing, or how disorder spreads. It shares only the phrase broken window with the criminological theory.[2]

Unit

A judgment of net benefit that weighs seen spending against unseen forgone uses

Recovery means

Not applicable

Measured by

Reasoned as a thought experiment about opportunity cost, not measured empirically

In social psychology, the broken-windows idea becomes a testable claim about disorder as a trigger for norm-breaking: seeing that others have violated one rule makes people more willing to break other rules, so disorder spreads. Keizer, Lindenberg, and Steg tested this directly in their 2008 paper The Spreading of Disorder, running six field experiments in which they introduced signs of disorder, such as graffiti or litter, and measured whether passersby then littered, trespassed, or stole. They reported that visible disorder raised the rate of these violations, offering causal evidence for a contagion of norm-breaking. This is a controlled test of one proposed mechanism, not the broad crime theory and not a statement about policing. The referent is the behavioral spread of rule-breaking under observed disorder, measured in an experiment rather than argued from a parable or read off a map of crime.[4]

Unit

The rate at which observed disorder raises other norm violations

Recovery means

Removing the visible disorder is expected to lower the spread, as the experiments imply

Measured by

Tested in field experiments that vary a disorder cue and record whether people then break an unrelated rule