Why are genuine spare parts so expensive?

Car parts. Everyone understands that the genuine spare part is probably better quality and is likely to cost (and be worth) more. 

Photo credit: Shutterstock

I have noticed a big difference in the pricing of spare parts. Why are genuine parts so much more expensive than independent brands? -- Many readers

A less well-documented motoring stress is “Spare Parts” Rage which, given my vague association with motoring matters, is often reported to me.

PAYE Tax Calculator

Note: The results are not exact but very close to the actual.