What "negative externalities" did you have in mind? Can you provide some examples?
The notion of the negative externality can be used to justify all manner of government intervention, but I shall try to restrict myself to an example where the state involvement genuinely is necessary: the case of SIFI's -- systemically important financial institutions, or, banks whose failure would cause either an outright market failure, severe economic damage, or both.
The negative externality here is the tremendous amount of risk offloaded onto the public's back. I think that the government has a legitimate claim to either limiting the size of such entities or otherwise instituting policies that limit the damage when they fail, thereby reducing or eliminating the negative externality. Many such measures were incorporated into Dodd-Frank, including higher capital requirements, caps on leverage, more oversight, and a bit more regulation regarding derivatives (like putting them on exchanges).
I'm not aware of any purely free market method for providing essential banking services while maintaining or avoiding SIFI status without the aforementioned negative externality, nor any historical examples of such. Can you point to one?
That's fair. But let's hope that "minimum" continues to mean what we both think it means.
Our uses of the word are probably rather close, given that we are probably both of the opinion that the government ought to be
less involved in just about every market, across the board.
I don't see them that way. I just see them as occupying two different domains.
How's this for neckbeardianism?
You appear to be well-shaven!