Clans are for citizens who want to organise themselves in smaller groups and have a collective treasury together.
Citizens who are closer in their values, skills or geographically can decide to pool resources together to deploy for things they like and need that aren’t necessarily relevant at the level of the ecosystem.
They have complete autonomy over these funds and governance rules but benefit from the network effects of the wider ecosystem.
Some clans can decide to hire specific skill, rent offices, provide health insurance for their members, etc. The possibilities are endless.