I want evidence for this- meaning, parts where costs are reduced - and the lifetime reduction they create- i want to see the correlating curves without spikes b

I want evidence for this- meaning, parts where costs are reduced - and the lifetime reduction they create- i want to see the correlating curves without spikes before i swallow that myth. Once we had handwoven goods- and they where expensive, and im sure the very first luddites had lots of tails, how machinery would reduce the quality of non-guild woven material.