In which I post about a TL9 solar system

[AlexanderHowl]

12 billion for the system. If we assume that Earth has a Habitability of 8 and a RVM of +0 (average), then the maximum carrying capacity is 3.75 billion at TL9 (7.5 billion at RVM+1 and 15 billion at RVM+2). I am being generous and assuming an RVM+2 with 80% capacity (reflecting the very real fact that average fertility drops of a cliff the more wealthy a society becomes at TL7+).

Beyond carrying capacity, you divide average wealth by (actual population/carrying capacity). For example, if Earth is RVM+0, then we are 3x carrying capacity at 2020, meaning that per capita income will be $10,300, which is pretty close to nominal world GDP.