As a noun, merchandise is goods that are bought and sold, especially in stores. As a verb, to merchandise is to promote and sell products, often using advertising or special displays.
From Old French “marchandise” meaning 'goods, wares', from “marchand” 'merchant, trader', from Late Latin “mercatans”, from “mercari” 'to trade'. It is related to “market” and “merchant”, all tied to buying and selling. English kept the spelling close to French.
Merchandise, merchant, and market are all cousins in a big family about trade. In pop culture, 'merch' turns this long French‑Latin word into a punchy badge—T‑shirts and toys that turn fandom itself into a product.
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