Although regional crop yields may vary, food exchange between human populations mitigates that variability. O’Dwyer examined mathematical designs of exchange to anticipate results on human population stability. When food is broadly scarce, as in times of drought, some patterns of food exchange assistance to preserve human populations, whereas others are destabilizing and cause depopulation. Well balanced reciprocity results in population stability throughout a variety of agricultural productivity situations, whereas resource pooling does not. Thus, the pattern of food exchange that a society falls under may be a consider determining their long-term stability.
One Earth 2, 269 (2020).