Has anyone ever shown this to be true, from a consumer standpoint? I don't rush out to buy milk because I'm worried about the dollar inflating 2-4%/year and I'm certainly not going to wait six months to buy it because it might be cheaper. Deflation doesn't compare to the changing prices of technology due to new innovations. What kinds of purchases are delayed?
You're right, it's hogwash. This has been discussed in depth in other threads. What actually happens is the cost of capital returns to a sustainable and realistic level absent central bank manipulation. Money is tighter than with perpetually subsidized low interest rates, but the economy is also more stable and less subject to the Kondratieff (business) cycle, and wild speculation in stocks and real estate, along with the subsequent recessions is avoided.
The biggest problem with deflation is the tendency for labor to want to protect its wages even in the context of generally falling prices. There is a psychological impact to having wages reduced which is independent of the fact that the prices of the things typically bought may become relatively cheaper. This tendency has historically resulted in layoffs which has affected real output negatively, and this has served to create the idea of deflation as a "bogeyman" that must be avoided at all costs via the inflation tax.
I assume Japan's CPI index like the US's includes a housing component, right? Couldn't the continued decline of real estate values account for the whole "deflation" they are seeing?
I don't know the specifics of how Japan concocts its price indices, but if its like others then it doesn't include asset prices, but rents instead. As the recent housing bubble showed us, there was a large disparity between rental inflation and real estate asset inflation, and so this may not be effective in obtaining the big picture about deflation.
