This is an excellent article from the Los Angeles Times by James Q. Wilson, one of our best thinkers about crime and public policy, in which he discusses the relationship—or non-relationship—between crime rates and the economy.
An excerpt.
“If you think a down economy causes crime to rise, think again. The reasons that drive crime rates are unclear.
By James Q. Wilson
January 8, 2009
“Last week, the Los Angeles Police Department reported that in 2008, for the sixth consecutive year, crime fell in the city. At a time when the economy was reeling and unemployment was rising, serious crime dropped about 2.5% over the previous year.
“I wish we fully understood why.
“During the last two decades, scholars have made great progress in explaining why some individuals are more likely than others to commit crimes, but very little in explaining why the crime rate in a city or nation rises or falls.
“Everyone knows that there is more crime in economically depressed inner-city neighborhoods than in affluent suburbs. That fact leads naturally to the assumption that if a community becomes more prosperous, crime rates will go down, and if income levels decline, crime rates go up.
“Economists who have checked this view have discovered that it is often true, but not always. They have found, for example, that the burglary rate goes up by 2 percentage points for every 1-percentage-point increase in the unemployment rate. That sounds like a big change until you realize that if the unemployment rate rises from 6% to 8% (which is about what it is in California now), the burglary rate will increase by 4%. Because burglaries aren't measured all that accurately (some are never reported, and police vary in how they report the statistics), it's not certain that we would even notice so small an increase.
“A lot of other factors affect the crime rate as well. It often goes up when the population gets younger, and when drug abuse becomes more common. Murder rates are profoundly influenced, at least in big cities, by gang activity. We don't have good ways of understanding why gang activity changes, though we suspect that changes in behavior are influenced by what the police do, whether gang truces have worked and whether gangs are fighting over drug and other illegal transactions.
“All these imponderables make it difficult to fully understand why crime rates rise and fall. In the 1960s, the national homicide rate rose by 43%, even though the country was in a period of great prosperity and low unemployment. The homicide rate fell in the 1980s, even as the economy was wobbling, with high interest rates and a steep rise in business bankruptcies. In the 1990s, the murder rate fell by 39% at a time when unemployment also was declining.”