Las Vegas is sometimes called "Sin City" due to the popularity of legalized gambling locally, and legalized prostitution in nearby counties (to say nothing of other, illegal sins). The nickname favored by local government and promoters of tourism is "The Entertainment Capital of the World." In the last fifteen years or so, many huge, extravagant casinos have been built, and the emphasis has turned from gambling and other "adult" pursuits to entertainment for both adults and children. In addition, concerted effort has been put forth by city fathers to diversify their local economy by attracting light manufacturing, textiles, banking, and other commercial interests. The lack of any state individual or corporate income tax, and very simple incorporation requirements has fostered the success of this effort. Having been late to develop an urban core of any substantial size, Las vegas has retained very affordable real estate prices in comparison to nearby urban centers. Consequently, the city has recently enjoyed an enormous boom both in population and in tourism. At this writing, the greater Las Vegas metropolitan area is the fastest growing population center in the United States.