EBay Inc. says it’s changing its user-feedback system to keep buyers from leaving, but the plan has sellers worried they’ll no longer be able to weed out untrustworthy shoppers. Buyers and sellers have been able to rate each other at the online auctioneer since its birth in 1995, when eBay founder Pierre Omidyar envisioned a virtual marketplace built on trust among buyers and sellers. Come Feb. …
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