The story
- Middle English · inherited frommarchaundising“commerce, trading; commodities, goods; (plural) dealings with other persons”
- English todaymerchandising
From Late Middle English marchaundising (“commerce, trading; commodities, goods; (plural) dealings with other persons”) [and other forms], from marchaundisen (“to engage in commerce, traffic”) (see further at merchandise (verb)) + -ing (suffix forming gerunds). The English word is analysable as merchandise + -ing (suffix forming nouns from verbs).
Etymology from Wiktionary, CC BY-SA 4.0.