The Fairfield County housing market was characterized by substantial sales volume, limited inventory and rising prices with a noticeable improvement in the luxury market. There were 2,743 sales in the county, up 8.2% from the year-ago quarter and the most fourth- quarter sales in thirteen years. Listing inventory fell to the lowest level in 17 years as sales volume remained high. There were 3,839 listings, down 7.6% from the year-ago quarter. The county…