evolutionary advantage of overpopulating

10.14: pol/overpopulation/evolutionary advantage for the poor:
. not only are the poor losing more children to sickness,
they may also need to compensate for losses from
implied survival tactics of the culture .
. often the only way to spread genes of the poor
is to send out pioneers to invade areas already populated;
and, because this style of invasion is so dangerous,
it can only succeed when large numbers are involved .