There is definitely the fiscal policy aspects (Abu Dhabi has good reason to let Dubai and its backers know that it will not necessarily bail them out) and there

There is definitely the fiscal policy aspects (Abu Dhabi has good reason to let Dubai and its backers know that it will not necessarily bail them out) and there are also socio-cultural aspects as well. Abu Dhabi is much more conservative than Dubai and there is some friction there that is getting magnified by the financial aspects.