...simulations of more than 20 million virtual “neighborhoods” demonstrate a troubling paradox: that community and diversity may be fundamentally incompatible goals. As the authors explain, integration “provides opportunities for intergroup contact that are necessary to promote respect for diversity, but may prevent the formation of dense interpersonal networks that are necessary to promote sense of community.” [...] Their models focus on the emergence of the “community-diversity dialectic” based on two simple principles: homophily – the tendency of people to bond with others like themselves – and proximity – the tendency of people to bond with those nearby. Their models look at how the strength of these basic tendencies affect the evolution of neighborhoods comprised of two distinct populations (say by race, class, ethnicity and so on). In these simulated neighborhoods, the possible levels of integration ranged from 0 percent (totally segregated) to 50 percent (totally integrated).