Final answer:
When Mr. Lindner drops by the Younger household, he offers to buy the house back at a higher price.
Step-by-step explanation:
When Mr. Lindner drops by the Younger household, he offers to buy the house back at a higher price. This offer is made because Mr. Lindner represents a racist group that does not want African American families, like the Youngers, to move into predominantly white neighborhoods. By offering to buy the house, Mr. Lindner hopes to prevent the Youngers from moving in and maintain the racial segregation.