Both mean "goods" or "merchandise", but 商品 is used often to refer to commodity contract goods, or staple goods on a commercial or large bulk scale, like container shipments of wheat, corn or rice sold to a processing plant. Or a shipload of bananas.
品物 usually refers to goods on a smaller scale, like store stock, or individual items, store merchandise. Seems to be used more for manufactured goods that you would find in stores, rather than massive bulk staple items as in the first example above.
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Both mean "goods" or "merchandise", but 商品 is used often to refer to commodity contract goods, or staple goods on a commercial or large bulk scale, like container shipments of wheat, corn or rice sold to a processing plant. Or a shipload of bananas.
品物 usually refers to goods on a smaller scale, like store stock, or individual items, store merchandise. Seems to be used more for manufactured goods that you would find in stores, rather than massive bulk staple items as in the first example above.