When you say "right", you need to distinguish between "accurate" and "reasonable". The OP has correctly described Amazon's approach to commingling (claimed) S

When you say "right", you need to distinguish between "accurate" and "reasonable". The OP has correctly described Amazon's approach to commingling (claimed) SKU's. And you have correctly concluded that policy is likely to lead to bad outcomes for both buyers and sellers. Whether it's a bad policy for Amazon as a corporation remains to be seen.