Singapore has no minimum wage. If its underclass were not destitute, I would think that would be rather surprising.
Singapore, of course, is nothing like this.
When the bus drivers tried to strike against explicitly racist pay policies they imprisoned and beat them: https://www.wsj.com/articles/BL-SEAB-2274
They don't substitute. Unions are basically illegal.
There are people earning ridiculously low wages.
https://msf.gov.sg/Comcare/Pages/Short-to-Medium-Term-Assist...
https://msf.gov.sg/Comcare/Pages/Public-Assistance.aspx
Here's the BBC on what this looks like in practice: