As someone who's only ever had to contend with inflation, the idea of prices coming down doesn't seem so bad, at least not at first blush. But, of course, firms can't continue to pay people the same amount if revenue falls, so wages, eventually will come down. In the end, overall, we'd be likely to end up where we were, though some people would be better off and others worse (especially if wage cuts are unevenly spread via layoffs).
Economists in the last thirty years have written quite a bit about "sticky wages," the fact that wages are often slower to respond to price changes than say bread and milk. Sticky prices of anything are a problem in the face price changes because it creates temporary distortions that may not reflect the underlying relative market values of goods.
But the ultimate sticky price item is debt. In the past fifty years homeowners have taken advantage of this fact to achieve good profits on a not very exciting investment, housing, which, on average, rises in value just above the inflation rate. Since the mortgage debt does not rise, the homeowner achieves an increased profit.
Deflation reverses this process, and not only for homeowners, but anyone from firms to governments with debt.
As John Kemp explains, via reuters, the only thing worse than Stagflation is Debt-Deflation:
From the late 1960s through until the current decade, relatively
high rates of inflation ensured that GDP continued to grow in nominal
terms even when it fell in real ones during cyclical recessions. Even
during the deep recessions of the 1970s and 1980s, nominal GDP was
generally growing because the decline in real output was more than
offset by relatively high rates of price and wage inflation.
Payment ability for households which experienced unemployment and
firms that experienced a sharp drop in demand for their products was
often severely impaired. For these few, homes were often repossessed
and individuals and companies could be made bankrupt.
But for the majority of households that remained employed, and for
companies that experienced only a moderate decline in demand, wage and
price inflation continued largely unabated, continued to raise their
nominal cash flows, and make it easier to pay off debts incurred during
the previous boom.
The combination of falling output with rising prices (labeled
“stagflation” ) is usually seen as the worst possible outcome for the
economy. Well, the worst except one: debt-deflation.
Because stagflation in the 1970s and 1980s ensured that, for most
people, the real burden of debt remained manageable, or even improved,
despite the recessions. The misery was borne by the minority of workers
who became unemployed and the minority of firms that became insolvent.
For the rest, inflation continued to boost nominal cash flows and
increase debt-service capacity.
In the most indebted nation in history (in nominal terms, of course) deflation is probably the last thing we need.