i guess something that would readily appeal to the youth, an accessories or clothing store, since these products are cheap to produce & easy to store. you just need a good location, some local promotions, creative gimmicks & of course, quality, unique clothes.
that would actually depend on your interest so i think you should ask yourself what would that thing that you'd never get tired to doing and where you see yourself growing, maturing & improving, that's when you'd know you're in the right business.
what do you think would be the best business to put up in singapore? something small and not that demanding for starters..i'm thinking of putting up my own but im not yet sure what kind..any suggestions?