 Early theories explaining the determinants of postmarital residence (e.g., Lewis Henry Morgan, Edward Tylor, or George Peter Murdock) connected it with the sexual division of labour.However, to the moment when Korotayev's research in this field began, cross-cultural tests of this hypothesis using worldwide samples had failed to find any significant relationship between these two variables.Korotayev's tests have shown that the female contribution to subsistence does correlate significantly with matrilocal residence in general; however, this correlation is masked by a general polygyny factor.