After three straight quarters with year over year increases in listing inventory, the trend reversed and listing inventory fell 6.6% to a record low of 8,944 in the fifteen and a half years of tracking it. The scarcity of supply has pressed prices higher for an extensive period. Despite this shortage, the number of sales has been expanding year over year for three straight quarters, rising 2.1% to 7,611 from the year-ago quarter. With record-low…