 Korotayev studies variables that are usually regarded as the main causes of the decline of unilineal descent organisation (statehood, class stratification and commercialisation), along with a variable that had never been regarded as such a cause – deep Christianization.He postulates that the traditionally accepted causes of the decline of unilineal descent organisation (statehood, class stratification, commercialisation) are less significant than deep Christianization.He also theorises that the presence of unilineal descent groups correlates negatively with communal democracy and is especially strong for complex traditional societies.