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Since @RogueTraderEnthusiast brought up an old utopian favourite of mine in the thread on Roman industrialization, I thought I'd make a challenge out of this:
Have co-operatives become the dominant form of rural land-ownership and economic organization in a majority of Roman provinces, with a PoD after Augustus (because I don't want the diversified, cash-produce oriented latifundia of that time butterflied, so no tribal subsistence solutions please)! By co-operatives I mean the overwhelming majority of those working in the agricultural complexes also owning them and somehow controlling or participating in their management and getting a share in the profits.
Keeping marginal slavery around is OK, although abolition gets bonus points. Seasonal wage labour is tolerated, too, if it's not a majority of total annual labour. Military solutions are as good as civilian ones; nominal property by the emperor or othe abstract entities are OK, too, if the members have safe and reliable usufructuary rights.