Singapore doesn't have a minimum, and wages there are not zero. (Neither did Germany until recently.)
It's about 3x the size of San Francisco and clearly has aspirations of becoming a similar center for startups but with the prevailing wages for the people who do all the actual work so low the quality of what is produced is usually shitty.
It's not a place you'd want to emulate.
Also, having lived in Singapore for years, it's a wonderful city and I love it, but the wage story isn't necessarily one to mimic. It might look grand as a foreigner, but your cleaning lady is probably sharing a 3 bedroom apartment with 16+ other women and doesn't see her family more than a few times a year.