Another study found that the 2.5 percent decrease in unemployment between 1992 and 1997 resulted in a decrease of 4.3 percent for robbery, 2.5 percent for auto theft, 5 percent for burglary, and 3.7 percent for larceny. Sociologist Karen F. Parker strongly linked the growth of Black-owned businesses to a reduction in Black youth violence between 1990 and 2000. In recent years, the University of Chicago Crime Lab worked with the One Summer Chicago Plus jobs program and found a 43 percent reduction in violent-crime arrests for Black youths who worked eight-week-long part-time summer jobs,
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