The "eventually" points at a new steady-state, after these changes have settled down: Previous: 2 Old / 4 Adult / 20 children born, of which 10 survive = 3 dep

The "eventually" points at a new steady-state, after these changes have settled down: Previous: 2 Old / 4 Adult / 20 children born, of which 10 survive = 3 dependents per adult "1. bigger gen" = 2 Old / 4 Adult / 20 children, all surviving = 5.5 dependent / adult "Next generation" = 4 Old / 20 Adult / 60 children = 3.2 dependent / adult "eventually" = 20 Old / 20 Adult / 20 Children = 2 dependent / adult (Real numbers are better than this b/c productive adulthood is more than 1/3 of life. It's simplified here to make the math easier to follow).