Deflation sounds good, until your economy goes into a death spiral and everybody gets laid off.
http://www.aei.org/outlook/100971 . . .
There is a bigger risk that deflation will intensify sharply because once the price level actually starts to fall, the demand for money will be further enhanced. A deflationary spiral--a self-reinforcing, accelerating drop in the price level--can result. This is because a falling price level means that cash "earns interest" since it enhances the purchasing power of otherwise sterile cash assets that pay zero interest, just as interest on a bond adds to its value in terms of its ability to be used to buy goods and services. That is why deflation drives down nominal (market) interest rates just as inflation drives them up. The "real" return on cash rises as inflation falls, thereby further boosting the excess demand for money and, in turn, exacerbating deflationary pressure. The fact that deflationary real returns on cash are not taxed further exacerbates deflationary pressure by enhancing the demand for cash.
The "Zero Bound" Looms
The Fed's dreaded "zero bound problem," whereby interest rates even at zero percent are still not low enough to stimulate demand, results from the rising real return on idle cash that subtracts from demand growth as deflation accelerates. Once the Fed has cut interest rates to zero, as it has done on short-term loans, any rise in deflation boosts the real return on cash that, in turn, exacerbates deflation. The Fed is, and has been, forced to print money by purchasing Treasury securities and mortgage-backed securities in order to satisfy the deflationary rise in money demand.
Beyond a crisis-induced rise in the precautionary demand for cash, and the related tendency for bank disintermediation, postcrisis deflation pressures can be enhanced by an excess supply of goods and services beyond that caused by the rising demand for cash. This is because the run-up in asset prices that creates a bubble in the first place lowers the cost of capital while the bubble is inflating. Firms find it easier to borrow as prices of risky stocks and bonds rise, so they add to productive capacity. Households, encouraged by cheap credit, buy more cars and houses, thereby increasing the stock of durable sources of a stream of housing and transportation services.
Once the bubble bursts, wealth is destroyed and workers are laid off--both causes of a sharp drop in demand for goods and services, whose supply is increased by the sharp increase in investment during the rise of the financial bubble. Excess capacity adds to the deflationary pressure induced by a sharp rise in the demand for money and the disintermediation that accompanies a financial crisis and its aftermath.
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