So Mithos, this inflation and deflation at the same time...is that like speeding into a sharp curve, too fast into the apex, feeling your tail lighten up... and then...hit the gas and pull the handbrake?
Mundell was found of saying that you can't hit two targets with one arrow...are you suggesting that we can hit one target by shooting two arrows in opposit directions?
Are you using a quantity theory definition of money...inflation is more dollars than demand...deflation is less dollars than demand? If so, how do both happen at the same time?
If you reject the quantity, Friedman monetarist definition, do you subscribe to a definition that relies on the index measures alone (what I call, 'eating the menue' theory; i.e., confusing the picture with the food), then how do we see the CPIs or the PCEs both rising and falling? Do you mean that sectors will diverge...say housing down, health care up, autos down, electronics down, materials down, education up...like that? Most folks who think that way confuse supply demand imbalance, the effect of government price control and monopoly support, seasonal or demographic statisitcal effects.. for inflation/deflaton...its not coexistence its just index compositon confusion; its a dysfunction of the index system of measurement...usually these imbalances, inconsistencies in the indexes, don't trend and don't last.
There is a difference between an overarching inflation or deflation and the common noise of index component price behavior.
You have to explain to me how you can construct a working theory of inflation and deflation as distinct phenomena and suggest that they can exist at the same time. Looks to me that you are just having some cognitive dissonance. I think you have to choose one.
And Thurston, deficit spending matters very much in a deflation becuase the effect of deflation is to increase the carrying cost of accumulated debt while decreasing the receipt of nominal sovereign revenues use to pay that the sevice on that debt and meet promised entitlement spending...something will have to give if you can't steal and cheat with inflation.
The big risk has been described by Williams at Shadowstat...its the arrogant keynesian orthodoxy, BP driller certainty, that increased debt and deficit to fund expanding fiscal stimulus by spending on the public sector carries no risk...exacts no cost...where is the economic blow off valve?