Blockbusting is when a person or group of people buy up houses in an area and then try to sell them for a much higher price. It often works by buying a house cheaply and then convincing the homeowners in the area that lots of people from other races or backgrounds will be moving in and that the value of their homes will go down. This can cause a lot of people to panic and sell their house instead of waiting to see if this is actually true. The person or group then makes a lot of money from then selling these houses at a much higher price.