No, the market is not always determined by supply and demand. Look what happened to gold and silver over the past year. The price dropped, demand went sky high, and the priced dropped more.
It is very much possible to manipulate markets...
The same people that sell something, can be the same people that buy it at the same time.
They would take a loss... but they wouldn't care. What's more or less fiat currency to a central banker?
You cannot compare a commodity like 'gold' that has an 'unregulated supply' to Bitcoin that 'has a regulated supply'. What I said is correct, you are trying to compare things that cannot be compared. (Again, people without qualifications becoming self proclaimed experts overnight)
I'm not trying to be an "expert"... Just trying to present a scenario where price manipulation would be possible.
Selling.. and then buying your own sale at a loss. If this is not at all possible with bitcoin please explain.
Do you think there was no price manipulation in the early days of bitcoin with Mt. Gox and other exchanges?
The 'scenario' has already been outlined by others here in previous posts. If someone were to start buying large quantities of Bitcoin the price would increase dramatically. The people selling Bitcoin are miners, they did not have to pay someone for the Bitcoin's they are selling. They would just say 'thank you very much for all your money'. If you tried to sell it for less than you paid, they would laugh at you and say 'Ok, you can have some of your money back, and I get all my Bitcoin's back, and I get to keep the difference'. You cannot 'win' by buying high and selling low. It is not like a stock market, where to own a stock, you must buy it. Here you can create Bitcoin's without buying them.