Well, most of the population are slaves anyways, without realizing it. The slavemasters tell the slaves that they are free, they don't have to work for them anymore. But they're also getting kicked out: no more free food and housing. So if the slaves want to survive, they'll have to keep working. But that's alright, they're not slaves anymore. They work for Pay. The slavemasters give them pretty rocks that they can use to buy food and housing.