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1) Increased motivation among those empowered to make decisions.2) Greater consistency in the decisions made.3) The development of skills among the junior members of the management team.4) An increase in the speed at which essential decisions are made.
Consistency could be missed out if a structure is not defimed in a decentralized system. In every decentralized system there should be a structure within which identified / experienced member will make the final decision for the group.
I think option4 is also important. If people at the branches are afraid or incompetent to take decisions the speed of correct descision making may not improove.