…the diversity of the Washington economy is an illusion, for each of its business sectors is to some degree a creature of the region’s single great industry–the federal government. According to a 2007 report by the Tax Foundation, for every dollar in taxes Washington sends to the federal government, it receives five in return. Fuller says that over the past 30 years, the federal government has spent $860 billion in the D.C. region, two-thirds of that since 9/11.