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The composition of arrests for Part I offenses also changed significantly with the shares of robbery and larceny increasing and those of burglary and auto-theft decreasing. The annual rates of change of the shares of the various offenses in total arrests for property crimes are reported in Table 2.
If the economic model of criminal activity developed by Becker (1968) and Ehrlich (1973) provides a valid explanation of criminal behaviour, it should also prove useful in explaining the temporal changes in the composition of crimes. The purpose of this paper is to demonstrate that such is the case. In particular, because of the differences in the sensitivity of the various crimes to economic variables, changes in those variables over time will result in changes in the composition as well as the volume of juvenile property crimes. [ABSTRACT FROM AUTHOR]

This article presents a reply from the authors on the comment by writer Mark Ladenson regarding the previous article about the wage differential existing in the northern and southern states in the U.S. The authors finds the analysis of Ladenson objectionable on three grounds: a) his arbitrary exclusion of available data, b) his choice of a low budget cost of living as a deflator, and c) the possibility of heteroscedasticity which would render his testing procedure invalid. The North Central and western regions have significantly higher wages than the Northeast. Whether these differentials can be accounted for by some other explanatory variables, or whether they are equalizing differentials for nonpecuniary regional differences or whether the economy was simply in disequilibrium in 1967 are questions which can only he answered by further research.

Focuses ont he possibility of endogenous growth through the application of dynamic growth theory to regions in the U.S. Treatment of regional investments; Generation of self-sustained regional growth; Rate of growth of the income influences.