Greek democracy created at Athens was direct, rather than representative: any adult male citizen over the age of 20 could take part, and it was a duty to do so. The officials of the democracy were in part elected by the Assembly and in large part chosen by lottery in a process called sortition.
I think human societies are characterized more by competition because, in terms of surviving, nowadays, there are more living creatures than food, therefore, there are some people who will starve to death if they won't strive hard to have food to eat. The competitiveness of the humanity is not only measured in terms of surviving but also in other social sciences like economics, politics, and others, which could also relate to the needs and wants of each human.
