That is exactly what I was referring to. If you made Detroit into a true tax haven, guaranteed to last for a long time, that was also part of the continental US, I am pretty confident it would make a huge difference in the economics and population of the city.
That isn't going to happen. Congress isn't going to uniquely favor Detroit over every other location in the country, and a program of this type has to be tightly targeted. The benefit comes because you attract a whole bunch of tax and regulation averse people and companies into one place; if you have many such places you dilute away the effect. Also, such a program would have a huge cost in terms of Federal revenue, and it is hard to imagine Congress coming up with a way to pay for it.
People propose stuff like this because they have ideological axes to grind--either they would like to demonstrate how low taxes and regulation would lead to utopia, or they need some kind of proposal to address the problems of a place like Detroit without the actual governmental intervention they abhor, and they don't care whether the proposal is politically impossible to accomplish.
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