This question is incomplete. Nervertheless I can answer based on my knowledge.
An area or a point of agreement of both theories is population grows more than the resources.
Malthusianism is a sociological term to refer to the set of theories raised by the British economist Thomas Robert Malthus.
In his demographic theories, Malthus states that the rate of population progressively increases while the resources (necessary for life) progressively decrease.
Also, he affirmed that the birth of new beings would gradually make life difficult for the human species (it could even cause its extinction).
On the other hand, Neo-Malthusianism is a theory based on Malthusianism Thomas Malthus because they agree on the idea that the population grows more than the resources and this can produce a Malthusian catastrophe (extinction)
However, it distances itself from Malthusianism, because it considers as the main problem the excess of large families and the unlimited reproduction of the poor classes.
According to the Neomathusians, society must become aware of this problem. In addition, he raises the need for limited procreation, the separation between sexuality and reproduction to avoid this catastrophe.
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