Selgin on deflation(s)
Professor G. Selgin (University of Georgia and Cato) has masterly studied the question of deflations and distinguished those benign deflations, associated with increasing productivity and economic growth, from those recessive deflations associated with stagnation in the economy, increasing unemployment and financial instability, which seems to be the only one mostly considered by all and sundry. As Hayek did it in the 20s and 30s last century, Selgin has studied in detailed this question and has emphasised the notable implications of distinguishing amongst these different types of deflations in the running of a sound monetary policy rule (see his excellent Less than zero. The case for a falling price level in a growing economy, fully available at the IEA website).
One of the main implications of his analysis of deflations for policy making is that price stabilisation (either the price level or the inflation rate) is not a desirable policy criterion if we are committed to achieving monetary stability in the long term: it can lead to excessive money growth in the expansions of the economy (thus, monetary disequilibrium), being a major pro-cyclical policy that will destabilise financial markets in the medium to the long term. Other, both theoretical and operational, critiques to price stability as a policy criterion can be found here. This is by far the main lesson that can be drawn for the recent financial crisis and its precedent years, and it will a be very useful one if we do not want to resume the same policy rules that have contributed to the recent crisis and the monetary and financial chaos in which we are still in.
Enjoy George Selgin’s video, which is a recent CNBC interview; it is an excellent and brief explanation on the nature and consequences of different deflations: http://video.cnbc.com/gallery/?video=3000171632