... historians who tried to measure the level of the industrialisation and economic growth during the time of the Industrial Revolution calculating an annual growth rate for the amount of industrial output. For the nineteenth century they used an incomes approach, looking at the numbers of people employed in different areas of the economy and multiplying these numbers with the available wage data from that period. In fact they took the data from 1850 and hence calculated backwards. They also took into account available tax assessment and rent data to estimate the amount of profit generated in non-work areas. However the data is not comprehensive by any means, there are numerous gaps which might have led to serious errors and miscalculations. Deane and Cole themselves admit that there may be errors in their estimations. Women and children for example were not respected in their work, neither were self-employed. For the eighteenth ...

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