Why Are Archaeologists Unable to Find Evidence for a Ruling Class of the Indus Civilization?

“The most tantalizing feature of the ancient Indus Valley remains is what they appear to lack: any trace of a ruling class or managerial elite. This defies the longtime theoretical assumption that any complex society must have stratified social relations: that collective action, urbanization, and economic specialization only develop in a very unequal culture that takes direction from the top, and that all social trajectories evolve toward a common and universal outcome, the state.”