Although displaying distinctly hierarchical and despotic features,
Incan rule also exhibited an unusual measure of flexibility and
paternalism. The basic local unit of society was the ayllu, which formed an endogamous nucleus of kinship groups who
possessed collectively a specific, although often disconnected,
territory. In the ayllu, grazing land was held in common
(private property did not exist), whereas arable land was parceled out
to families in proportion to their size. Since self-sufficiency was the
ideal of Andean society, family units claimed parcels of land in
different ecological niches in the rugged Andean terrain. In this way,
they achieved what anthropologists have called "vertical
complementarity," that is, the ability to produce a wide variety of
crops--such as maize, potatoes, and quinoa (a protein-rich grain)--at
different altitudes for household consumption.