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Large parts of those states are not included in the diamond he outlined, but if you add them all up, all 5 states, it's about the same GDP as California. But,

• jordache 9y ago
  for the most part, outside of the major cities, the rest of the state is not generating much gdp
  • encoderer 9y ago
    But there are major cities in those states not included in his Diamond. Most notably: Philadelphia, Springfield, Peoria, Lansing, MI, Grand Rapids, Mich, etc
    • santaclaus 9y ago
      Philly isn't in the Midwest, hell, it's almost in the Atlantic!
      • tzs 9y ago
        That was his point. The article said that a region it outlines has an economy bigger than California. But adding up the GDP [1] of all the states that overlap that region gives an economy about the size of California's. Philly is in a state that overlaps the region, but is not in the region. Hence, adding up the state GDPs overestimates the GDP of the region by at least the GDP of Philly. [1] technically, I believe it is actually called the GSP (Gross State Product) in this case.