Surprising as it may seem, the cause of the great enrichment is still unknown. That is to say, there are plenty of theories about why incomes started growing so rapidly in some parts of the world in the early nineteenth century, and this then spread to the rest of the world, and – despite repeated predictions that it would stop – they just keep on growing today. But none of these theories commands universal allegiance. Some credit institutions, others ideas, others individuals, others the harnessing of energy, yet others luck. They all agree on two things, however: nobody planned this, and
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