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Most Amazon sellers don’t fail at fulfillment or customer service. They fail at product selection. Here are the most common product research mistakes, why they happen, and how to avoid them before a single dollar of inventory is committed.

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The biggest mistakes Amazon sellers make when choosing products come down to a predictable set of patterns: choosing products based on personal interest rather than market data, underestimating the margin impact of Amazon’s fee structure, entering categories dominated by entrenched competitors with no clear path to buy box share and committing to inventory before validating supplier pricing at real volume.