The minimum wage ensures that those 'poor people' can afford to eat.
The countries you mention don't need minimum wages set because they have other mechanisms or even just social norms that ensure nobody is having to work 8 jobs to try to feed their kids.
Right, which is exactly what I was saying, those societies mentioned as not having a minimum wage tend to have other mechanisms to either set an effective minimum or structures to help out. It's not like those other countries without minimum wages also give poorer people the finger in every other way, like the US does, and as I imagine would be the case in your (obviously) libertarian fantasy-land.
Might want to update your profile then, it still says London.
What do we know about Singapore? It has masses and masses of public housing, so people are looked after in a way that doesn't happen in the US. The US is very keen to push this sort of thing on employers - see also health insurance.
It's a different model and I would agree probably a worse one, but either way it's the state ensuring people have their basic needs met.
The countries you mention don't need minimum wages set because they have other mechanisms or even just social norms that ensure nobody is having to work 8 jobs to try to feed their kids.