Oh, and even in the case of the second story family B could go to work for the cattle farmer. Can the last politician to go out the revolving door please turn the lights off?
To smooth your first scenario -- As they receive money, they can (or should) invest in productive assets.
None of this, of course, reaches the question of inter-generational equity and non-renewable resources. Words and ideas I offer here may be used freely and without attribution.