A reader sent me a topic to write about. Very interesting topic which I did think about. There are many expensive cars in HDB carparks. Who owns them? How much do the owners earn? Cos I, myself also has felt how come I can't afford such a vehicle. There are many ways to look at this question or comment, and of course I don't have all the answers, but I'll try to shed some light with what I know. Observation bias Firstly, there are a lot of expensive cars in HDB carparks. But, there are also a lot of regular cars. We tend to notice the nicer, bigger cars. So there is a bias when we see these cars. I think if we really go and count them, we would end up with around 10%-20% being expensive cars. Which is reasonable. Next, there is the willingness to spend I have a friend he earns $10,000 per month by ......