That's part of why I think the benefits of the US moving to some kind of single-payer or similar healthcare system would be much larger than they look based on

That's part of why I think the benefits of the US moving to some kind of single-payer or similar healthcare system would be much larger than they look based on a naïve cost calculation—our healthcare system consumes a ton of largely uncompensated giving-a-shit from a very large proportion of our society (basically everyone who's not very rich). I have to think that's harming other activities (including health itself, since, as covered, eating well and exercising requires a pretty large amount of giving-a-shit) some of which might provide direct benefits to measures like GDP, if some of that time and giving-a-shit were recovered for other purposes.