Some people ask why I don't compare the highest performers to the lowest, because surely that would give the greatest contrast and it would be easier to see what the high performers are doing?
This is absolutely not the case, for the reasons I explained in this post (https://www.genius-at-work.co.uk/2014/01/comparing-average.html).
Another common misconception, probably related to our human tendency for attribution bias, is that we regard individuals as special and different, and erroneously believe that their skills are locked up in their heads. Perhaps they were even born that way. You only have to look at the excitement amongst fans when their favourite sports team signs a new 'star player' from another team. The chosen one! He/She will save us!
Again, not true.
In any system, we will see maximum efficiency when the parts of that system are aligned.
Rocket engines are the shape that they are so that they efficiently match the pressure of the engine with the surrounding air pressure. Rockets that launch astronauts to the Moon or ISS have two or three 'stages', because the shape of rocket engine which works at sea level does not work in the upper, thinner layers of the Earth's atmosphere.
In electronic systems such as a telephone network, we have to match the electrical qualities of the different components in the telephone handset, the cable to the exchange, the switches, the amplifiers and so on. If we don't, we lose electrical energy and create heat. This is called 'impedance matching'.
If you have a hifi, look at the back of the speakers. They will probably say "8Ω" which means 8 Ohms, a unit of electrical resistance. If the speakers are rated at 2Ω, the amplifier will damage them by shoving in too much electrical current. If the speakers are rated at 16Ω, the amplifier will be damaged by the extra work it's having to do to drive the speakers. The inefficient alignment of the components causes energy to be lost as heat, and heat is not good for hifi components.