I had an impression that everthing else's value can be decided by a market price expressed with the currency, but currency's value is only decided by consensus
For example, although 4x more money have been printed since 2008, and GDP growed at a very slow pace, the price of everything stayed relatively stable, because the consensus of USD's value has not changed, so "more USD = more wealth", not "more USD = lower USD value"
And once that consensus has been reached, without a fundamental change in the system, the value of the currency will not change
Same for bitcoin, I think its value should be decided by some kind of consensus, not supply and demand. It's arguable how to establish this consensus though
As Keynes described it, what you are talking about here are the phenomenon of "sticky prices". Nobody remembers when a big luxury home was $5,000 new (1850's) or when a decent brick one was still $16,000, or when a new Ford went down to $500 from $1,000 or a new economy car was $1999, but they all expect a decent home today to be $149 - $200,000 and an econobox car to be $17,000. People will accept small incremental inflationary increases over time but not a huge one at a single bite. Markets will accept price "bargains" without a blink, but will completely stall or erupt in boycotts of hostility over any sort of a "X" "crisis".
With Bitcoin Over the Counter (OTC) Funded Credit Swap Derivatives, the price and very pricing structure of this new "funding vehicle" is the main barrier to it's acceptance as any form of sort of a "money", period, let alone it's competitiveness as a validly dependable and stabilized Medium of Labour Exchange "Currency" in the global or any local marketplace.
While the rest of the planet's economies careen down the Neo-Keynesian toilet water-flush swirl of the endless "monetized-debt" inflation doomed to them by their suicidal Freidmanist Urinate-Down "voodoo" counter-economics, we genuinely still have a chance here to float this boat against their tidal waves of greedy private-monetarist economic self-destruction. When their current suspension of all interest rates ends it will be a global marketplace calamity such as the world has never seen.
Currently while one might wish to pretend that the "laws of supply and demand" or as you put it "some kind of consensus" are somehow "controlling" the wildly inflationary and deflationary hourly torture-spirals of it's unknown and unknowable moment to moment exchange-value, the Bitcoin Credit Swap Derivative is priced by the foolish and capricious antics of corrupt, greedy and mischievous penny stock market speculators on a deregulated wild-penny speculation market that poses as a "currency exchange". The number of Bitcoin Credit Swap Derivatives will never ever have as much of an impact on their credit-swap exchange-values as the brainless lunacy of this idiotic "come and take me over" penny-stock market "pricing" madness does, and will continue to do unless saner heads prevail.
Bitcoin OTC-fCS Derivative Pricing Problems:
The purely fiat price of purely fiat-valued Bitcoin Swap Derivatives is completely anarchic nonsense and currently deviates plus or minus 30% on an hourly, daily or weekly basis due to infantile penny-stock market speculators dancing it's exchange value around to feed their crazy antics with little-peanut bet-bids. Catastrophically, those who suffer most severely from this childish, stupid and inane "penny stock market" exchange valuation scheme are large clients with large wallets, who are the very market we so desperately wish to serve.
If one carefully looks at any chart on any given day one can clearly see that price valuation fluctuations have nothing to do with supply or demand volumes, and are totally a function of small-potato speculation biddings. Fee and bidding schemes are 100% of the problem.
In any normal Medium of Labour Exchange "currency" valuation, a money changer always has "reserve pools" much like barrels of money-notes to which he applies the day's or weeks most recent exchange rates. If a merchant, contractor or producer needs the foreign currency they can get a bucket or a few buckets or a few or a barrel full of them at the given rate. Not only that they can be fairly sure the exchange rates will stay relatively stable from day to day or week to week.
In the stupidly ignorant Bitcoin OTC Funded Credit Swap derivative market this has been made impossible. All Bitcoin OTCfCS buyers must wait for sellers willing to part with all that they need for a price/profit the sellers alone see fit and all Bitcoin OTCfCS derivative sellers must wait for buyers willing to buy (all of) them at a price (or loss-bargain that) the buyer deems fit. This means that haggling over the price of a tenth of a BTC has as much of an affect on it's minute to minute exchange-value as the supply or demand for 10,000 of them does.
Moreover it gets much much worse than this because in terms of value through-put it is simply unbearably tortuous and impossible for any large retailer to transfer any meaningful amount of liquidity through a so-called "Bitcoin Exchange" at any given price or range of them even if or during all in one day, let alone when doing up a bank deposit at close of business-day. Trying to exchange 10,000 Bitcoins is impossible to do in any single transaction at any but the most punishingly low or high price, without inciting an instant "penny stock market" stampede. Invariably speculators will horn in on the large buy or sale until it can never be finished.
Such large volumes always leave huge price gulfs between bids and asks in their wakes inducing even further volatility
What these so-called "exchanges" need to do is to act like exchanges not like penny stock markets.
We need:
Tightly regimented bid/ask echelon-rungs about the current basis price to facilitate patient bargain seekers at low fees.
Higher fees for smaller transactions
Higher fees for more frequent transactions
Daily limits on or exponentially higher fees for high frequency bidding/bidders
Exponentially higher fees for further out of range ask echelons beyond the "normal" basis-centric range
Exceptions for trigger floor bid "price support" bids.
The idea is to encourage stable price-upwards growth at controlled rates while accommodating heavier wallets to be able to pass throughwithout causing huge waves or taking massive losses to negotiate a single order.