What I am seeing is that active listings declined across the board ti shortage levels in 2012 and all prices came off lows. Then from there active listings in desirable / prime location areas flattened out at shortage levels and remain there today. In the less perfect locations, the active listings increased and prices stabilized off lows but did not continue higher to new highs. But in the less perfect locations active listings are now back to shortage levels. So this is why now the regional active listing data is showing fresh lows. I think the areas that did not fully recover now begin moving back to prior highs and eventually to new highs.
The last time around we broke supply and demand in to its user vs investment components. If all the action is at the margins it is that last 10% of demand (in an increasing market) or that last 10% of supply ( in a declining market) that drives the trend. So if the investors added that extra demand on the way up they will also add to the supply on the way down, thereby enhancing the effects of each.
Anyways, in a still-increasing market (which is where we are now) the homes sell pretty quickly. You don't start running into longer exposure times until the inventory starts stacking up, which in turn is what will drive the prices toward stability, and later on into decline. .
In our region, (San Diego County)
6,098 sales from 01/2004 - 04/2004 (median of 17 days on market)
5,711 sales from 01/2005 - 04/2005 (median of 41 days on market)
Some segments in this region started peaking a couple months later, while others didn't peak until 2006 or even 2007
4,578 sales from 01/2006 - 04/2006 (median of 51 days on market)
3,971 sales from 01/2007 - 04/2007 (median of 56 days on market)
Then it levels out for a bit before we start seeing the most motivated sellers surrender and start lowering prices.
5,282 sales from 01/2017-04/2017 (median of 19 days on market)
4,769 sales from 01/2018 - 04/2018 (median of 16 days on market)
There are currently 4,057 actives. Not quite 3 months supply. That's more than 51 days. Obviously, some of them will never sell so the ones that do will have shorter exposure times than the 10.2 weeks of actives would otherwise suggest.