New York's luxury real-estate market is crashing

What does it mean that 1 in 10 units currently on the market are sold? Sold in what period of time? Without stating that, this seems like a useless measure… in my market I’m sure none of the currently available 1000+ properties are going to sell in the next 10-minute window. But I’d bet over 90% will sell in the next 12 months. Choose some intermediate time frame and you can cite any value you want between 0% and 90% for this statistic.