5 of 406 ideas

$500-3,000 of equipment — inflatable screen, projector, speaker — that pays for itself in one to six rentals, in a category where one operator does $3-4M a year

Buy panels, drop them at a construction site, collect rent for eight months while doing nothing — $20-30K per job, sold for $600K after 18 months

Rejected by Y Combinator for having no proof, a Lagos developer stopped building and personally called about 150 businesses — the 400-merchant waiting list he got back was the proof, and the company later sold to Stripe in a deal reported at $200M