A two-sector model of urban unemployment is developed which focuses on the formation of a secondary sector under conditions in which a demand shock in the primary sector leads to a sharp increase in unemployment. The optimal location in the secondary sector (treated as a single firm) is shown to...

This is the second part of a two-part analysis of optimal spatial search begun in Harwitz et al. (1998). In the present article, two explicit computational procedures are developed for the optimal spatial search problem studied in Part I. The first uses reservation prices with continuous known...

Limited research has been conducted on the interactive effects of salinity and boron stresses on plants despite their common occurrence in natural systems. The purpose of this research was to determine and quantify the interactive effects of salinity, salt composition and boron on broccoli...

Research addressing the interactive effects of the dual plant stress factors, excess boron and salinity, on crop productivity has expanded considerably over the past few years. The purpose of this research was to determine and quantify the interactive effects of salinity, salt composition and...

The aim of this paper is to show that both location and race matter for explaining the high criminality rate in cities. In our model, blacks and whites are identical in all respects. However, if, for no economic but for extrinsic reasons, everybody (including blacks) believes that blacks are...

We consider two typed of cities. In the European one the amenities are located at the city-center ( like e.g. Paris or London) whereas in the American-type city the amenites are at the city-edge (like e.g. Detroit, Los Angeles). We first show that the unemploymed reside at the vicinity of the...