The business, practice, or institution of promoting and selling fads; trend-mongering as a commercial enterprise.
From 'fadmonger' plus '-y' suffix (as in 'snobbery,' 'chicanery'), creating an abstract noun describing the activity or business itself.
The '-y' suffix transforms 'monger' into a whole system or way of operating—'fadmongery' sounds almost like an economic sector, which actually, it kind of is!
Complete word intelligence in one call. Free tier — 50 lookups/day.