A new approach for the description of phenomena of social aggregation is suggested. On the basis of psychological concepts (as for instance social norms and cultural coordinates), we deduce a general mechanism for social aggregation in which different clusters of individuals can merge according...

Using data from a sample of households in 1994 we find that Danish household labour allocation choices are best described by a collective model in which decisions are made cooperatively. Individual preferences are similar but there are important differences due to the differences in educational...