Disinflation in the context of Logarithmic derivative

In economics, deflation is an increase in the real value of the monetary unit of account, as reflected in a decrease in the general price level of goods and services exchanged, measurable by broad price indices.

Deflation occurs when the inflation rate falls below 0% and becomes negative. While inflation reduces the value of currency over time, deflation increases it. This allows more goods and services to be bought than before with the same amount of currency, but means that more goods or services must be sold for money in order to finance payments that remain fixed in nominal terms, as many debt obligations may. Deflation is distinct from disinflation, a slowdown in the inflation rate; i.e., when inflation declines to a lower rate but is still positive.

Reflation is used to describe a return of prices to a previous rate of inflation. One usage describes an act of stimulating the economy by increasing the money supply or by reducing taxes, seeking to bring the economy (specifically the price level) back up to the long-term trend, following a dip in the business cycle. It is the opposite of disinflation, which seeks to return the economy back down to the long-term trend.