For a more direct example with future actors: Cell phone battery life has stayed mostly stable, even as battery capacities have gone up and processor energy/in

For a more direct example with future actors: Cell phone battery life has stayed mostly stable, even as battery capacities have gone up and processor energy/instruction has gone down. This is because mobile device performance is mostly power-constrained: manufacturers have a target of about a day of battery life as the minimum consumers will put up with, and whenever more energy is available they'll turn up performance or add features until battery life goes back down to that minimum.