Yes, we'd just need some kind of signal that was proportional to demand. If the demand was high, the signal would also be high, so that consumers would know it

Yes, we'd just need some kind of signal that was proportional to demand. If the demand was high, the signal would also be high, so that consumers would know it was time to cut back on consumption. And likewise, for producers, a high signal would indicate that it was time to bring on extra capacity. Of course, we'd want the signal to be something meaningful that people wouldn't ignore. It would be best if the whole signaling infrastructure was decentralized, so that producers and consumers could act according to their own needs without coordinating through a central authority. It seems like there may be a startup opportunity in there somewhere.