Decreasing the velocity of money addresses the fundamental cause of inflation.
Inertial inflation on the other hand is based on expectations, that is where we are today. You need to address both since raising central bank rates has little effect on consumer psychology. I'm also doubtful of the effects of the BCRA rate on the dollar blue, I think there are a lot of other factors which are contributing to decline in the price.
The peso has been pegged to the dollar since 2003 however it's hasn't proved effective for controlling inflation, and for the last couple years it hasn't done any favors for Argentine industry either. It has also been extraordinarily expensive while principally benefiting special interests.
A dollar peg (re peg?) has to follow devaluation. I strongly disagree with Ed Rooney's opinion about the value of internal demand and import substitution for the overall economy. It did work to reduced unemployment but just like convertibilidad, we've held on to it for far too long and it's turned a pair of cement boots. We need to cut the dead weight and stop stifling viable growth opportunities.
Psychology might be relevant in trying to determine the sources of inflation. For example: Are people buying dollars because dollars are a good investment, or are they buying dollars because the front page of Clarín says they should?
However, fixing inflation or deflation is pretty straightforward, and psychology has little to do with it. You either decrease or increase the currency in public circulation -- something that requires cooperation between both monetary policymakers and fiscal policymakers. We see this cooperation (some may call it "interference") between the BCRA and the government. We do not see it in the U.S., which is presumably why you mention the importance of psychology here because the Fed has really tried to stoke inflation fears in speeches, reports, etc.
It's all an illusion. The problem here is that the Fed's easing program (QE) benefited US Treasuries (and the stock market and real estate by extension) -- not the pocketbooks of consumers -- and that
government spending in the U.S., which is one sure fire way to increase inflation, has consistently decreased since the financial crisis. A central bank can't make you spend money that you don't have or aren't eligible to borrow.
The aftermath of expanding or contracting is the hard part. Either way, psychology (demand [inflation], or lack thereof [deflation]) cannot defy supply. If you have less money, you spend less. If you have more money, you
can spend more.
The value of internal demand and import substitution is crucial for any economy to survive long-term. We are in the last days of the model by which countries like the U.S. or the U.K. take on billions in debt to sustain gaping trade and current account deficits. This was the problem in Argentina in 2001. It's the problem in Europe now. It's the problem that the U.S. will soon face -- and when it does, so will the rest of the world. We're very close.