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GDP is a decent proxy for how "busy"/"great"/"big" the CBD will be in doing a region's transactions. The higher the GDP, the greater the demand from people to bring their "trade" to the center and the greater the need to build denser (taller) so that those transactions can happen near to each other.When discussing the urbanity of Boston, why is Providence's GDP relevant? I understand it is relevant in discussing Boston's economic influence. But isn't that an entirely different debate?
Square feet of CBD office space measures a similar thing, but then we'd quibble over CBD boundaries (in Atlanta and Houston) and whether Federal office space counts (in DC)
High GDP, high pay, busy lawyers. Strip away the Roman Revival vs Prairie Style vs Modern debates, and "how valuable is your art?" and a lot of what you're left with of urban greatness is commercial activity.
I excluded Providence by using the more-tightly-drawn GDP, but will concede that a lot of Providence's "Federal-regional" tasks are done in Boston (1st Circuit court of appeals, Federal Reserve, international air freight...). The bigger PVD is, the busier Boston's core gets.
Here's a cool geo-economic-concept, the "Trading Area" originally developed by Rand McNally but adopted by the FCC that answers the question "who you gonna call?" (from your cellphone) which is a great predictor of "which is 'your' big city". It also predicts/reflects other transactions like where the airline hubs are (in the capitals of most MTAs), and which is 'your' NFL franchise (can Boston be great if its team is in Foxboro? Is Philly greater 'cause theres is downtown?)
Unsurprisingly, Boston is the capital of the New England Major Trading Area (which includes PVD). All the "big urban" cities are "capital" of a high-GDP (though not necessarily physically large) Major Trading Area (Denver's and Minneapolis' are huge, Philly's is moderate, and Columbus OH is pinched from all sides.
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