"To face deflation, you have to have people accepting it and not reacting to it."

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Significant changes in the growth rate of money supply, even small ones, impact the financial markets first. Then, they impact changes in the real economy, usually in six to nine months, but in a range of three to 18 months. Usually in about two years in the US, they correlate with changes in the rate of inflation or deflation." "The leads are long and variable, though the more inflation a society has experienced, history shows, the shorter the time lead will be between a change in money supply growth and the subsequent change in inflation.

— Milton Friedman