It's also my understanding that almost everyone in Singapore lives in some sort of government-subsidized housing. The system is structured such that it's difficult to get an apartment or buy a house unless you're married so many typical Singaporean households have several adults earning an income under the same roof.[1]

[1]https://www.economist.com/asia/2017/07/06/why-80-of-singapor...

Clarification - Singaporeans live in these flats (HDB housing) - not expatriates. Expat families live in different neighborhoods, different apartments, go to different schools and eat in different places than the locals. No part of an expat life is subsidized. It is therefore unfair to say that almost everyone in Singapore lives in subsidized housing - almost all of the Singaporeans do.

Nobody prohibits a privatised HDB flat tenant from subletting it.

It's a big stretch to say that every expat lives in a landed property.

My first place in Sing was a room that I shared with 3 Indian labourers, and no aircon.

Then, when I moved to a more upscale place thanks to hefty sales commissions, I think everybody was bedazzled "how such a pipsqueak can rent a place for $1800 by himself." Only then, I realised that only top few percents of Singaporeans can afford to live in non-HDB condominiums.

As pointed out elsewhere -- That's the median resident income. There's a huge class of workers that are never given residency that are purposefully ignored by the official stats. Roughly 1/3 of the inhabitants of SG are non-residents who typically work low wage jobs (nearly all domestic help in this category) and they have very limited rights.

> median household income

Not median per person for the whole population including non-residents in the country.