 "Gesellschaft"-based relationships, according to Weber, are rooted in "rational agreement by mutual consent", the best example of which is a commercial contract.To emphasize the fluidity and amorphousness of the relationship between "Gemeinschaft" and "Gesellschaft", Weber modified the terms in German to "Vergemeinschaftung", and "Vergesellschaftung", which are the gerund forms of the German words.Weber's distinction between "Gemeinschaft" and "Gesellschaft" is highlighted in the essay "Classes, Stände, Parties", which is the basis for Weber's three-component theory of stratification.