Provide a tentative explanation for all of the following four empirical regularities.
A.In most inland European cities, historically the rich have lived on the western side of the city.
B.Most large corporations have their headquarters in the downtown of a large metropolitan area but their clerical operations in a small city.
C. Over the period from 1960 to 2000, the fare-box ratio (the ratio of fare revenue to operating cost) in US metropolitan areas fell from about 100% to under 40%.
D. In 2003, the FBI crime index indicated 741 burglaries per 100,000 people, while the U.S. Bureau of Justice criminal victimization survey indicated about 3000.