What happened to communities when many residents move?

When many residents move away from a community, it often leads to a decline in local businesses and services due to reduced customer bases. This can result in decreased economic activity, which may further prompt more residents to leave, creating a cycle of decline. Additionally, the sense of community and social cohesion may weaken, leading to increased isolation among remaining residents. Moreover, property values may drop, impacting those who remain and potentially leading to a change in the demographic makeup of the area.