Prices which is Just a game of Supply and demand is highly dependent on Supply as there is Constant buying at a certain rate all the time. A bit over supply drops the prices. There are few landmarks when huge supply hits the market,
1 When a new Phase is Launched::: Goto recently Launched Phase 8 Z Block the prices were very Low Almost 40% of Today price and Not long Back. At the time when DHA 8 Proper had already recovered.
2. Soon after Ballot: Many investors are holding their property till they get Maximum return, These usually make investment till ballot is there, some sell soon before ballot[if they are satisfied] some wait till ballot. post ballot prices dipped in DHA 7 and 8 and we will see may be it will happen in IVY Green as well, This is transient selling pressure and soon prices recover.
3 Soon after possession:: again investors rush the Market to sell.Transiently price got depressed as we see today in DHA phase 7 and LDA avenue 1 Today. That phase is also eventually over the and price recovers.
If as per mian in Phase 9 new files are issued against land then soon you will see may little more drop in prices. But as I told there is Constant Slow buying the prices will recover soon.
I don't know if really there is marginal trading of Files as transfer charges are so high that marginal trading does not look possible. So i don't blame big Gamers for all price fluctuations. 
