@Radical_EgoCom Threat of de-federation and the desire for insurance motivates participation in the system. However, if investment in the internal capital of the household is more profitable than accepting a given external exchange is likely to be, motivation to say "nope, sorry, gave at the office." And the richer the household, the better it is at self-insuring.
@Radical_EgoCom Unequal exchanges do happen, but they are gifts, exchanging economic capital for political capital. If the gift is too large for the recipient to ever pay back, the recipient becomes the donor's "slave," to some extent.
So how could equal exchange between communes not lead to unequal investments in internal capital? How could unequal exchanges not become slave-making gifts?