The Economics of Crime: Gary Becker's Idea

How Gary Becker's 1968 paper modelled crime as a choice shaped by expected costs and benefits, and what that model does and does not explain.

In 1968 the economist Gary Becker published a paper called “Crime and Punishment: An Economic Approach”. The story goes that he had the idea while late for an exam he was giving: he weighed the cost of parking illegally against the chance of getting a ticket, and chose to park illegally. He then wondered whether the people who break laws might often be making a similar calculation.

Crime as a choice

Becker’s model treats a potential offender as someone who compares the expected gains from a crime with the expected punishment. The expected punishment depends on two things: the probability of being caught and convicted, and the size of the penalty if that happens.

A crime with a gain of 1,000 dollars, a one in ten chance of being caught, and a fine of 5,000 dollars has an expected punishment of 500 dollars. On this simple arithmetic the crime looks worthwhile. Raise either the chance of being caught or the fine enough, and it no longer does.

This framing leads to a key policy idea called deterrence: society can reduce crime by making it less rewarding, either through more policing, more reliable courts, or tougher penalties. It also means that improving legal opportunities, such as better jobs, can reduce crime, because the gain from crime is compared with what a person could earn honestly.

What the model gets right, and wrong

Becker’s model changed how researchers study crime. Many studies find that people do respond to incentives: more visible police presence often reduces some kinds of crime, and better job prospects for young people are linked to lower crime rates.

But the model has clear limits. Many crimes happen in anger, under the influence of alcohol or drugs, or among teenagers who are known to weigh future consequences less heavily. People also misjudge risks. Behavioural economists point out that someone who thinks “I will never get caught” is not calculating the probability that the model assumes.

Two ways to cut shoplifting

A shop losing money to shoplifting could double the penalty it asks police to pursue, or it could add staff at the door so shoplifters are noticed more often. Becker's framework says both raise the expected punishment. Evidence on deterrence suggests the second, raising the chance of being caught, is often the more effective choice.

Thinking the model says criminals are cold calculators

Becker did not claim that every offender does careful maths. His point was that, on average, crime responds to changes in its costs and benefits, just as other behaviour does. The model is a tool for predicting how crime rates change, not a portrait of every individual.

Key takeaways

Gary Becker's 1968 paper treated crime as a choice shaped by expected costs and benefits.
Expected punishment combines the chance of being caught with the size of the penalty.
Deterrence and better legal opportunities can both reduce crime in the model.
Emotion, addiction, youth and misjudged risk limit how far the model applies.