I mean that going along in everyday life, we function primarily as part of a competive, commercial enterprise, concerned with creating a surplus of goods or a higher quality of service which equal profit. In a disaster or survival situation, the dynamic changes from one of creation of surplus resources to a redistribution of available resources, and the competetive, productive instinct that makes for good business isn't necessarily the most applicable.
For instance, you could think of your post-disaster group as company, and run it as such, hiring, firing, and feeding individuals based on how much food they can forage, thier skill sets and training, physical ability, attitude, etc. On the other hand, you could look at it as a collective, redistributing resources as needed, without regard to the concept of who's "earned it".
I think in most emergencies, or the short term act-of-God kind at least, the shift is more or less automatic from the first type of thinking to the second, but in terms of preparation, I see a lot of emphasis on the first ideal, with talk of providing supplies for your family and making a run for it etc., and little discussion of what can an individual would be able to provide for thier community in a larger sense.