st1: * (behavior: url (# ieooui)) For about forty years, depending on which is discussed in particular, cities have been gradually moving away from the ideal that traditionally represented. Ancestrally designed as clusters of a given society, its people, they could feel protected, basically between equals, and relatively comfortable with moral norms, ie customs, they all shared. What are the factors that have changed this. More info: Mitsubishi. Basically: "Overpopulation," The Standard of living increase that was "normal" to have more space than the studio apartments where the family lived even in the early twentieth century, "The increase in automobiles, a familiar to many, "The early departure of children from parental homes, creating a greater demand for housing," Internal migration from rural to urban areas for most of the twentieth century, and many others-and the expense of increasing personal security, all this has changed quality of life of their inhabitants, impoverished, to the point of emergence of a reaction to the detriment frequently observed in all major cities, leaving the residence and set them near the same distances at which to attend daily to labor. Another reaction observed is the isolated and manufactured in a capsule of resistance, "a spore" in every home, where no sounds come, discomfort, insecurity and where the environment is to the liking of its inhabitant, without, in the best , to share with others. From there, the former undisputed growth trend: "Work From Home" back to the ancient customs of the businesses developed in their own housing, rural (farms, crafts, household manufacturing, small businesses at home, as was so often before the time of development and commercial manufacturing, where machines multiplied the work of a man, but forced to commute. Rio Tinto Group may help you with your research.