Why are joint costs never relevant in deciding whether to sell a product at split-off or process it further?

Question

Quizplus · Accepted Answer

Joint costs are considered sunk costs because they have already been incurred by the time the decision to sell or process further is made. Additionally, these costs remain the same regardless of whether the product is sold at the split-off point or processed further, making them irrelevant for this decision.

Why Are Joint Costs Never Relevant in Deciding Whether to Sell