How about opening a food stall at school?
Based on the article, schools' cafeterias are generally outsourced. When operating on campus, there typically aren't rental costs—instead, the main expense is a commission, usually around 25%. Assuming an average gross margin of 60% for food service businesses, good cost control could leave roughly 35% net profit. The stall operator in the article ended up with 40% profit.
A school represents a fixed, low-competition market: as long as you put in the effort, customer traffic stays stable. Early promotional tactics like flyers or events, combined with one signature product, are usually enough to get things going.
Further Reading
> Offline Store Opening Guide: If You're Thinking About Opening a Physical Shop, Refer to Store Opening Notes for Inspiration to Build a Small but Beautiful Business (Plus a Collection of Previous Kindle E-Books)