... comes down to a matter of yards. Some places, like museums, attract a wide range of income levels. Schools are the most segregated. But in between, places like stores and restaurants, people just seem to ... sort themselves. They don't like being around others from different income levels, so they avoid each other, or in some cases establishments cater so firmly to one group that others feel unwelcome. No amount of top-down efforts can fix a problem that's based on people not liking each other.