@keith authoritarianism is a nonsensical term to begin with. Hierarchies and power structures arise necessarily because delegation is more efficient. Anybody who understands even a modicum of graph theory understands why a complete graph doesn't scale.
@yogthos yes but it's not necessary/desirable to build a rigid structure to deal with them. Sure, hierarchies and power develop but that's okay when they are small. Build a structure around them and they will grow. Now you have a problem.