Satellite images of near-constant strings of light across the United States describe what is referred to as “mega-regions.” The constant light across hundreds of miles of land represents emerging economic hubs, according to Atlantic Cities.
Phoenix to Tucson is one of those hubs. The economic output of the Phoenix-Tucson mega-region is more than $250 billion, only slightly less than that of Hong Kong’s, making Phoenix-Tucson one of the 50 largest economies in the world.
There are 12 mega-regions spanning the United States. Together the regions produce more than $13 trillion in economic output, or about three quarters of the Unites States GDP.