Before revision:  In contrast, individual-no-envy with three or more families  and individual-egalitarian-equivalence with two or more familiesare typically incompatible with efficiency, unlike the situation in an economy of individuals.
After revision:  In contrast, individual-no-envy with three or more families , unanimously envy-free efficient allocations always exist in economies with just two families. The unanimous fair share guarantee is easy to achieve: Under generic conditions the set of efficient allocations with the fair share guarantee contains some collectively envy-free and some collectively egalitarian equivalent allocations. We use modified versions of the traditional market equilibrium approach and individual-egalitarian-equivalence with two or more familiesare typically incompatible with efficiency, unlike the situation in an economy of individuals.