ABSTRACT
Geographical concentration and regional integration of industry are in general accompanied or followed by concentration in the units of production. Uniform supply of mass demand, as created by long distance supply of goods, must always be based on some concentration either of production or at least of the assembling of goods at or near the centres of production. A very interesting example of the concentration of units of production is afforded by the development of the manufacture of pig-iron. The number of pig-iron furnaces in England had been rising steadily between 1796 and 1880, although production in this industry had, of course, increased in a much faster proportion. Studies on the measure of "strewing" in different branches and sections of industry would probably reveal an interesting picture of the conditions surrounding the concentration of industrial units of production.
