[mynameishere]

Well, you're missing the point of insurance. A hundred people might need to collectively save a million dollars, but acting independently they would need 10 million. With the self-employed the tragedy of the commons would kick in mighty fast though.

[dualogy]

We could call it "credit", which the "banks" would offer out of their collective pool of customer "savings", not all of which need to be available to all "savers" at once.