[gocartStatue]

Small production batches are absolutely required for high quality (see Toyota, TQM)

[dehrmann]

But there isn't enough overall volume to ever get the kinks worked out.

[MichaelZuo]

That's only if they don't QC every single part, for every single car, coming from new suppliers.

Which RR would do to avoid the obvious problem, only after a supplier has been verified to be sending only the highest quality product, would they ease off.

The simplest thing is that the supplier charges double or triple the unit price such that they can accept half the parts failing inspection and getting sent back.