The Riverdale section of the Bronx, comprised of Fieldston, Hudson Hill, North Riverdale and Spuyten Duyvil, was hampered by low inventory, pressing sales lower. This combination of metrics kept the pace of the market brisk. The absorption rate, the number of months to sell all inventory at the current rate of sales, was 3.4 months, 20.9% faster than the 4.3 months in the year ago quarter. Listing inventory decreased 31.7% to 177 and sales fell 13.4% to 155 respectively from the year ago quarter…