How does series feedback pair work? (the art of electronics)
I'm studying AOE but i can't figure out how this circuit even works


If the 10 volt output rises a little bit then Q1's emitter is also raised a little bit and this has the effect of turning Q1 off a little bit. As Q1 turns off a little bit, its collector voltage rises. This has the effect of slightly shutting-down Q2 and therefore the slightly risen 10 volt output falls back to 10 volts.

It's negative feedback.