In the 6th century BCE the cultivable land was divided between the people. The beneficiaries were granted only the revenue of these lands and no administrative authority. There was emergence of the notion of private property, as there are references to the gift and sale of land.
According to B. B. Lal, former DG of ASI, Kalibangan site shows that an earthquake occured around 2600 BC, which brought to an end the Early Indus settlement at the site. It is perhaps the earliest archaeologically recorded earthquake.