the price jump has nothing to do with mining cost or difficulty. the number of bids vs asks on mtgox is heavily weighted on the bid side.
Yeah, obviously. And if it's raining out it's obviously caused by the rain falling from the sky. The real answer answers the question "why are people bidding more for BTC?" I'm not sure why you think more people bidding on mtgo is remotely important, that much is obvious. I attempted to predict the future results of a big change, and thus far I seem to be mostly correct (value is a few dollars short of being double what it was prior to the reward halving). You didn't predict anything correctly. It's easy to come in after the fact and claim it happened because of reason X.
more people want bitcoins(for whatever reason) and are putting real dollars on the exchanges to get them.
Chiropteran said:
If any of those miners wanted to continue to invest in BTC, or make purchases in BTC, they had to buy coins directly.
See? I already said what you seemed to think was the "obvious" reason, because it's directly related (and part of) the halving.
as blasting cap said, it may be the wordpress acceptance or silkroad. at pure speculation, i would guess its the all the potential assault weapons ban legislation induced buying spree making btc a required part of buying grey market arms. silkroad is known for being able to get you automatic or modified ARs and AKs. the upswing in btc could easily be from paranoid militia types grabbing all the hicap mags and black market rifles.
It might be, but prior to the halving any of those cases the savvy buyer could look at the price of a bitcoin and look at the expected returns of mining and decide that buying isn't as good of a value as mining would be. There was no reason for those users to buy bitcoins when they could be mined so easily. Now that the mining rewards are cut in half, buying is a much better choice, although as the price continues to creep upwards it gets closer and closer to the equilibrium value where potential mining holds back the value.
Here is another analogy. You are a chef and you need 40 lbs of deer meat for the main course of a banquet. You could buy the meat directly from a hunter and have it cut up and prepared at a minor inconvenience of your staff, or you could buy it at a butcher all perfectly cut and ready, saving your staff some time and trouble.
Prior to the halving, buying venison directly from a hunter costs $240 and buying it from the butcher costs you $500. The difference is huge, so you buy from the hunter and your staff prepares the venison, costs you some dollars in wages but all in all it's a much better deal than spending $500.
After the halving, the hunter is now charging you $480! If you were to buy it from the hunter, you would still have to further prepare the meat, and pay your staff for their time, and it would actually end up costing more than $500. So you go to the butcher, where you find the value of deer meat has actually gone up a bit, so you need to pay $520. Still, it's the best way to go, so you simply pay for the meat and go on your way.
The venison is BTC. The hunter is mining the coin yourself- less overall cost, but lots of inconvenience and work added into the equation. The chef is someone who wants to use BTC on silkroad, or wordpress, or to simply save and invest, it doesn't really matter at all. It makes sense to mine if you are getting a great "deal", but when the expected returns of mining are cut in half that deal is gone.