When we deal with a machine, there are three things we want to know: how much it can do, how fast it can do it, and with what degree of precision. These qualities summarise what distinguishes a good machine from a bad one: it is more productive, faster and more precise than a less good one. However, changes in scale, speed and precision in the real world all change the quality of the experience, and the ways in which we interact with one another: increasing them no longer gives a clearly positive outcome – it can even be very damaging. In human affairs, increasing the amount or extent of
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