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Re:Amazon’s share of the US e-commerce market is now 49% by dragonwriter on Saturday July 14, 2018 @01:47AM (#17529021)
Exposing which FBA sellers commingled would lead to avoidance of those sellers by quality conscious consumers, which would lead to more opting out, which would drive up costs and prices on Amazon. Preference for commingling is a deliberate choice by Amazon that consumer transparency on sourcing and avoiding fraud is less important than minimizing prices.
Re:Amazon’s share of the US e-commerce market is now 49% by fma on Saturday July 14, 2018 @11:45PM (#17533688)
A seller can opt out of comingling, but it costs the seller money. I assume amazon calculated the increase cost of the inventory control and pasts those cost on, so it won't drive down Amazon's profit.

Since Amazon doesnt label which seller opts out, it doesn't give much incentive to do it.