The document analyzes housing market inventory levels in Chester County, Pennsylvania from April 2008 to April 2010. It shows that the months supply of inventory decreased from 7 months in April 2008 to 5 months in April 2010, a 28% decline. The months supply of inventory measures how long it would take to sell all current listings based on the average monthly sales. The document provides a detailed monthly breakdown of housing statistics, including the number of homes for sale and sold, to analyze trends in housing supply and demand over this period.