by Calculated Risk September 24, 2024 1:12 PM
Two important points:
1) Home prices have clear seasonal patterns.
2) The surge in distressed home sales during the housing bubble burst distorted seasonal patterns. This is because distressed home sales (at the lower end) occurred at a steady rate throughout the year, while regular sales followed normal seasonal patterns. This resulted in greater seasonal fluctuations during the housing bubble burst.
Click on the graph to enlarge the image.
This graph shows the monthly changes in the NSA Case-Shiller National Index since 1987 (through March 2024). The seasonal pattern was small in the 90s and early 2000s, and increased as the bubble burst.
Seasonal fluctuations have diminished since the recession, but higher prices due to the pandemic have changed the month-over-month pattern.
The second graph shows the seasonal factors for the Case-Shiller National Index since 1987. The factors began to change near the peak of the bubble, increasing significantly during the collapse of the bubble as normal sales followed normal seasonal patterns and distressed sales occurred throughout the year.
Seasonal fluctuations had decreased after the recession but have recently increased again, although this time there has been no surge in bad loan sales.
