The document analyzes housing market dynamics in Philadelphia over a two year period from March 2008 to March 2010. It shows that the months supply of housing inventory decreased from 8 months in March 2008 to 6 months in March 2010, a 27.1% decline. The months supply of inventory is a measure calculated by dividing current listings by the monthly sales rate. The data indicates that between 2008-2010, the Philadelphia housing market transitioned from a buyer's market to a seller's market as the supply of homes decreased relative to monthly demand.