1In the two-minute animation below, sociologist Dalton Conley describes how inequality between families can create inequality within families. My favorite of his examples: if a family doesn’t have a lot of resources, it will often pour more of them into the most promising child instead of spreading the goods around equally to everyone.

For more, watch:

More at Norton Sociology’s YouTube page.

Lisa Wade, PhD is a professor at Occidental College. She is the author of American Hookup, a book about college sexual culture, and a textbook about gender. You can follow her on Twitter, Facebook, and Instagram.