What markup does a yard make on a whole compared to the sum of its parts? For example an electric motor vs the steel and copper, is the profit margin the same or do they make more/less with them broken down and sorted?

Or Is there an incentive for them to buy stuff I broke down over buying the whole? Or vice versa? Factoring in quotas and everything.



Trying to negotiate the best prices I can, and the one with the most info usually wins... Thanks