While the first quarter of the year showcased a whopping 38 percent year-over-year increase in transaction activity, the second and third quarters were nearly on par from a comparative standpoint, each posting an approximate 18 percent decline in transaction volume from 2017.  Nantucket real estate sales through September 30, 2018 included 306 transactions totaling $685 million, a cumulative three percent decrease in transactions and a two percent drop in dollar volume through the same period one year ago.  Single-family home sales remained steady as compared to the five-year average but were down on a year-over year basis.  Vacant land sales, on the other hand, posted record results from previous years.  Inventory levels rose modestly while price reduction activity increased just slightly. Here are Fisher’s September Market Insights…