The tale of three Singapores-upmarket, middle and down rung

This classification can be done for any country. But for a small island state like Singapore, this is easier to do and validate. From my observations/discussions with people, I could do the following demographic classification.

1. Upmarket:- Typically senior banking/finance/shipping professionals/businessmen/inherited wealth with 7 figure incomes. They can stay in privately build mansions, drive to work, shop till they drop in the upmarket Orchard Place(with A-Z luxury brands), eat in the amazingly expensive outlets on Clarke Quay, import domestic help from adjoining Asian countries etc. Basically, the equivalent of some South Bombay/BKC residents in India
2. Middle: Above professionals with incomes say above $70000-$140000(very approx range I may be mistaken in the exact figures). They can stay in a reasonable sized condo/HDB apartment, commute to office in bus/MRT, afford the essentials and that occasional shopping/partying binge, and that periodic domestic service. Lifestyle is not the tops but pretty good. Entry level expats would fit here
3. Lower rung: Sanitation, Supermarket and other workers. Their incomes may not cross $30000-50000, making it difficult to meet both ends. 

 Interestingly, I have seen Indians at all 3 levels, but more concentrated in the bottom 2 rungs-perhaps a reason why some Singaporeans may perceive Indians as their domestic workers. Apparently(as history informs), the original Indian settlers in Singapore were low skilled labour whose future generations became professionals. The older Singaporean settlers may not connect this though.

One challenge is 'cutting your clothes as per your cloth'. As  some Western expats told me, Singapore is more expensive than Amsterdam/London, and they find even $110000+ incomes hard to sustain on. Of course, Indian expats will have the reverse problem-ensuring that the new found wealth does not go to their head.