His basis for empirical evidence comes from longitudinal police data gathered in western Europe in the second half of the 20th century; the cross dimensional data comes from police statistics from the United States. Results of the comparison of Bonger's theory and this realworld data indicate that there is a negative relationship between individual prosperity and a fluctuating positive/negative relationship between crime and unemployment/prosperity at the macro-level. The speaker concludes that criminology is useful to the jurist, the academic, and the statistician while at the same time it may encompass the works of sociologists, philosophers, and psychologists. 4 figures and 140 references