I've seen it explicitly at work in the US, e.g. in choosing which partners to marry. Ironically, it is breaking down in India because of female infanticide cre

I've seen it explicitly at work in the US, e.g. in choosing which partners to marry. Ironically, it is breaking down in India because of female infanticide creating a skewed gender distribution (around 1.14:1, when the natural distribution is 1.05:1), and men having no choice but to look outside their caste if they want to marry.