I remember reading in Scientific American a few years back, about a study that was very striking and against common intuition. In manufacturing, robots had overtaken humans at a particular task by a long shot. They were able to perform the completion of assemblies much quicker and with higher accuracy; humans coming in afterwards and applying finishes that required small hands, light touches, or hard to explain measurements.
Robots > Humans. Humans finished what robots couldn't.
What wasn't foreseen, however, was that there was an additional step to shave off even more time. Given some artificial intelligence, the robots could actually tell the humans when, and how, to do assembly during and as part of the assembly process. The robot figuring out the most efficient assembly, and instructing the human to do what it couldn't, was a third step of assembly efficiency not foreseen.
It turned out:
Robots + Humans > Robots > Humans.