I am constantly asked by people in the slum, how much this cost or that cost. I am asked my salary, how much the plane ticket cost, how much my pants cost, how much my taxi from my room cost etc etc,
When you do not have money, cost and the price of things is of utmost importance. If you have money you do not think about it, but if you do not have it you think about it all the time. I never think to ask someone how much their pants costs, I have had whatever I wanted from a young age.