population growth of the city around it, and property values, while continuing to rise, were not rising as fast as those in the secondary business districts. Downtown was still the central business district, and was still the most important area for doing business and commerce, but it was no longer as dominant as it once was. Cause and effect The causes of decentralization, which decreased the importance of downtown in the life of American cities, have been ascribed to many factors, including each city's normal growth patterns; advances in technology like the telephone, which made it easier for business-to-business intercourse to take place over a distance, thus lessening the need for a centralized commercial core; the rise of the private automobile, which allowed shoppers to go to peripheral business districts more easily; a strong increase in streetcar fares; and the continuing problem of congestion in the narrow streets of the downtown area. As much as people disagreed about what caused decentralization, they were even less in agreement about how decentralization would affect the central business district, with opinions varying all the way from the belief that it would diminish downtown sufficiently that it would eventually consist of only offices and the headquarters of corporate giants, to the belief that decentralization would lead to the (perhaps deserved) death of downtown entirely as unnecessary, a victim of its untameable traffic congestion. In between were those who saw a diminishment of the area's influence, but not enough to prevent it from remaining the "Sun" that the outlying business districts revolved around. Others doubted whether decentralization had as strong an impact as it was credited with. Positions were taken that downtown was a natural part of the evolution of a city, or the unnatural result of a de facto conspiracy by merchants and property owners, so the question of what decentralization would do to downtown became bound up with the question about the area's legitimacy. Decentralization also increased the incidences of rivalry between downtown and burgeoning business districts. In Los Angeles, for instance, downtown and Wilshire Boulevard battled for dominance, and in Cincinnati the rivalry was between the old downtown centered around Fountain Square and the one on Canal Street. The diminishment of downtown by decentralization caused these battles to be between areas that were now more relatively equal. The Great Depression Like almost every other aspect of American life, the Great Depression had