Manufacturing (and installation, operations, and maintenance) efficiencies are more likely governed by Wright's Law, a/k/a Experience Curve Effects, which holds that there is about a 20% efficiency gain with each doubling of output.

<https://en.wikipedia.org/wiki/Experience_curve_effects>

This was first observed during WWII in aircraft and ship manufacture.

Note that this tends to be gains toward some ultimate efficiency limit, so remains bounded.

I've mentioned the concept a few times in earlier HN comments: <https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...>