The Unemployed

To a corporation, people are like engine parts. If it's cheaper to fix and retain it, they'll keep it; otherwise they let it go.

If you get fired or somehow lose your work contract, you may have no direct ties to any particular corporate entity but you do still live within the general corporate realm, and you are still in the system. You will still receive your UBI, and you will still be able to afford some form of housing. Many many many people live like this: they do gig work and random barter to maintain their mostly minimalist lifestyles. As seen from the corporations' point of view, the collective UBI is somewhat like a tax: it is the realistic cost of maintaining power. From this same point of view, advertising is a compensating subsidization.

If you fall out of the system completely, you will have no RP anymore; you will have no NIN (node indent number). You may end up in a squatter town or scavenging in the older, crumbling, unconnected parts of the city. Or leave the city altogether. I imagine tribes of "wild humans" out there somewhere, luddites, ruralists, religious cults, inbred families or anti-civ groups who eschewed incorporation and have now fallen to (or willfully embraced) alternative lifestyles, anarchist doctrines, or a more Hobbesian view of the world.

Notice in both of these cases that the other economies are still functioning: electronic money and barter are still available. Basically, when you fall out of the "comfort" of the corporate life, you find yourself in a place where relying on barter, compassion and direct face-to-face interaction with your fellow human beings - i.e. what we once called "normal society" - becomes your only means of maintaining your lifestyle or bettering your position. It's not impossible; it's not even necessarily hellish; there are many people who are perfectly happy living a “mincomer” lifestyle. You can still find love, art, and human kindness, like silver linings in the dark clouds of the world. It's just ostensibly harder, dirtier, and much more unpredictable.