Most nations have been set up with growth assumptions. I think you're right that in theory a nation with stable numbers for both can sustain itself. However, we

Most nations have been set up with growth assumptions. I think you're right that in theory a nation with stable numbers for both can sustain itself. However, we'd have to redo much of the infrastructure assumptions in place today [1], and currently I don't see any nations that are ready to take that plunge. [1] The only systems I see are either underfunded due to growth assumptions they haven't been able to hit, or are funded through natural resources that the country just happened to have. If there are exceptions I would genuinely like to know.