Before I go on to explain a couple of things, let me just say what my background is; I work with economics and marketing. I put up budgets every day, and I work with hundreds of different firms. I know VERY WELL how the supply and demand system works, and the real world standard model that we all relate to cannot really be compared to AO. More on that in a sec.
I have also - as many on RK2 know, been farming credits since I started playing this game right after launch - so soon 4 years. I have seen the change in the AO economy, and I have been a part of raising and lowering the prizes. I've been able to make 1b+ a week when the most expensive items out there was RBP's for 350m. I was also the one that started the insane RBP prices on RK2 by selling one for 900m when it was going for 400'ish, and everyone and their dog tried to sell theirs for even more afterwards.
Anyways, enough "bragging" if you want to call it that. First of all, there is a MAJOR difference between real world economics and AO. First of all, in AO you are never dependant of money. You don't have credits, who cares? No one is gonna kick you out of your home, cut your elecricity... you wont go to bed hungry. In AO, everything you buy is luxury. You might say that "but I need X weapon and it costs hell of a lot!"... well, if that "X" weapon is in the hundreds of mills, then you don't need it. Period. Almost everything you need, you can blitz. The rest is luxury. You don't NEED to be über, and you most definately cannot claim that being über is a right you have. It is like with respect. You cannot get it, you have to earn it.
If you agree with this, then you cannot disagree with me when I say that the supply and demand in AO is based on totally different values than most of us live our lives in the real life. In real life, we always weigh our luxury needs (new car) against our basic needs (food, shelter). In AO, we think luxury.
If you complain about the AO economics, then remember that you are complaining about that the distribution of luxury items isn't "fair". Well, fair and luxury have never gone hand in hand. Smart, hard-working, knowing the market... those are the words that describe a winner in this game of über-loot. If you complain, then you most likely do not fit any of these descriptions.
Work hard, but still don't have any cash?
Then you don't know your market.
You farm all the right items but you still don't get enough cash?
Work harder.
And there you have the wole formula of success in the race for AO-item überness. Simple as that.
So what determines what an item cost? Well, that's where the "Supply and Demand is not the same in AO as in RL"-thing come in. Not only is AO all about luxury, but the whole economics are based upon decisions made by a lot of different people from different cultures, at different ages and with different backgrounds. Yup, just like normal economics except that when it comes to for example stocks, knowing what a well-educated executive of a big company will do is based on what is most profitable for a company... and it has nothing to do with luxury. It is to feed the basic needs of that company and allow it enough economic growth so they can either expand or strengthen their position in their market.
When I recently bought a RBP for 2.3bill it wasn't because I thought it was a move that was smart to do. It would not strengthen my character much, mostly since it was for a crat. It was stupid, and I did it for fun. It was the same reason I bought a dbody and ql222 MBC for the same crat. Stupid. But fun. Totally unpredictable, and it gives a signal to the market that there is a demand for these items and that people are willing to pay high sums of credits for them... which brings me to the next "piece" of this ramble;
This determines what an item cost
*How fast an item sells on the forum. 7 bumps over a period of 3 days before it got sold when there was a flat price? The next seller might either set a lower price as min, and perhaps the same as the last one went for as BO, or sometimes a bit higher if the seller is optimistic.
*How many items there are out there of the same item. Look at RK2 MBC's. On RK2 a couple of months ago, one was sold for 1.3b. Much for an MBC, so right after that another seller tries it for 1.2b since the last seller had to make a few bumps before it got sold. Prophets (a friend of mine) immediately bought it for BO. 2 days after, a QL222 MBC is for sale. I buy it. All these sellers sold their MBCs for prices higher than had been normal for a MBC this QL range (220-228). Result? Lots of MBCs for sale. Even to this day.
*Item-nerfing or change of game mechanics. What would you say if your newly bought Ferrari suddenly got half the horsepowers? You'd get mad, and demand your money back. Doesn't happen in AO. Instead, most people that have an item that gets nerfed either directly or in-directly sells it right away. Everyone want to sell it faster than the next guy, so they dump the prizes accordingly.
*Other items introduced that are better/look cooler/etc. This is pretty self-explanatory.
These 4 important elements (there are probarbly lots more) are among the elements - together with supply and demand, that make up what items cost. Some of them are in ways connected to supply and demand, just like availability, which is a topic I haven't touched. Or even how much credits there are in circulation.
Summary
As you can see, it is ALOT harder to explain how the market works instead of actually explain how you can make it work for you - in your favor. Too many people are too stuck up with how the market actually works and start blaiming it for now working for them. The answer is that the market is too unpredictable and too advanced, so the person(s) who blame the market can never - read: NEVER - totally justify why the market is "wrong", "bad" or any other word that is synonymous. The best way to summarize it, is simply; STFU and get to work.