Growing up in the United States and residing in a variety of cooperative living situations, you come to understand different people come to these circumstances with very different outlooks on how humans should collaborate under the same roof.  Following is a synthesis of my observations based not just upon the actions of other humans but also my personal evolution and aspirations.  The tiers of outlooks are highly motivated by both the American culture and the individual maturity of each member of the home.  There will always be exceptions, and some people are giving in one area and selfish in another.  Importantly, there is no judgment being cast here, nor is this a statement that our community members have achieved anything in the way of communal enlightenment.  This is simply a summary of how individual outlook will influence the relationships that form around that person.  Perhaps this can be useful for others in considering how their outlook promotes or limits their personal growth.