Some interesting points but the specifics of hoarding are, I think, better explained by the game "prisoner's dilemma". Without communication, for the individual the choice is: hoard and have enough or don't hoard and maybe have enough vs neither hoard and we'll probably have enough and just you hoard and I don't have enough. Clearly there are better outcomes for the individual to hoard. If we had greater levels of community communication we could negotiate a share agreement but that possibility of communication doesn't exist in western culture.