It is used chiefly to express differences in interest rates.
Finally, when the target itself didn't change, as was the case between mid and mid, the effective funds rate did not persistently deviate from it. To achieve this mandate, the Federal Reserve conducts monetary policy by influencing market interest rates.
Some, like President Donald Trumpfeel such a move wouldn't go far enough and criticized the Fed throughout its hiking cycle that it kicked off in For example, the Fed could increase reserves to decrease the FFR and other interest rates, thereby encouraging economic activity when the economy was in recession to achieve its maximum employment objective.
See footnote 7. It has also mentioned the potential for lingering trade wars to hurt economic growth. The Fed raises rates in a strong economy to keep excesses in check, and cuts borrowing costs when the economy needs support.
How accurate are the Fed's projections?