How do you identify upper-class people?

When I walk to school, I pass a street full of wealthy people and I realize, I only can identify that they are wealthy from their cars. So I wonder how can you tell if someone is from upper class?

How do you identify upper-class people?

This is the bay I pass when I go to my school, if you are curious!

How do you identify upper-class people?
How do you identify upper-class people?
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