Most people outside New York have multiple children by the time their oldest goes to school, so there's opportunities to learn these things at home by playing w

Most people outside New York have multiple children by the time their oldest goes to school, so there's opportunities to learn these things at home by playing with your siblings. I'm guessing that only children are a lot more common in NYC than elsewhere, though, thanks to the impossibility of affording the kind of living space that people elsewhere take for granted. Perhaps the bitchiness of the kids is attributable to the high prevalence of spoiled only children?