A new study from the University of Washington on racial preferences in housing has implications for business. The study shows that, in the US, white people, when they move, move to predominantly white neighborhoods and black people to predominantly black neighborhoods. Alicia and I have observed a similar polarization in most countries where we have worked. People tend to form relationships, and feel safer, with people who are as much ‘like us’ as possible. However, in my experience, ‘like us’ is not just racial—it can be economic, it can be occupational, it can be gender or almost anything else. It is probably one of the psychological drivers of silos in businesses or the ‘them and us’ division between partners and the rest in law or accountancy firms.