Hello,
Dude this idea is already exist and like Flyburger said it's 30 day and without increase or decrease,
I mean the price stay same when who was have the house bought it example,
Who was have the house bought it with 325k and after 30 day it's become for sale,
So if you want to buy it you will buy it with 325k too,
That will not make the house prices unbalance and different
Regard,Zain