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Friedman proposed the K-Percent Rule was very different from monetary policy today. Adopting a K-Percent Rule would require considering what transitions need to take place.

Inflation-Targeting Rules. Inflation targeting is the current de facto Federal Reserve rule.** Under inflation targeting, the Federal Reserve chooses a target inflation rate—essentially the highest it thinks the public will accept—and then tries to engineer the money supply to achieve that goal. Chairman Jerome Powell and others before him have used 2 percent as their target inflation rate, although some are now floating 3 percent or 4 percent.** The result can be boom-and-bust cycles of inflation and recession driven by disruptive policy manipulations both because the Federal Reserve is liable to political pressure and because making economic predictions is very difficult if not impossible.

Inflation and Growth-Targeting Rules. Inflation and growth targeting is a popular proposal for reforming the Federal Reserve. Two of the most prominent versions of inflation and growth targeting are a Taylor Rule and Nominal GDP (NGDP) Targeting. Both offer similar costs and benefits.

Economists generally believe that the economy’s long-term real growth trend is determined by non-monetary factors. The Fed’s job is to minimize fluctuations around that trend nominal growth rate. Speculative booms and destructive busts caused by swings in total spending should be avoided. NGDP targeting stabilizes total nominal spending directly. The Taylor Rule does so indirectly, operating through the federal funds rate.

NGDP targeting keeps total nominal spending growth on a steady path. If the demand for money (liquidity) rises, the Fed meets it by increasing the money supply; if the demand for money falls, the Fed responds by reducing the money supply. This minimizes the effects of demand shocks on the economy. For example, if the long-run growth rate of the U.S. economy is 3 percent and the Fed has a5 percent NGDP growth target, it expands the money supply enough to boost nominal income by 5 percent each year, which translates into 3 percent real growth and 2 percent inflation. How much money must be created each year depends on how fast money demand is growing.

The Taylor Rule works similarly. It says the Fed should raise its policy rate when inflation and real output growth are above trend and lower its policy rate when inflation and real output growth are below trend. Whereas NGDP targeting focuses directly on stable demand as an outcome, the Taylor Rule focuses on the Fed’s more reliable policy levers.

The problem with both rules is the knowledge burden they place on central bankers. These rules state that the Fed should neutralize demand shocks but not respond to supply shocks, which means that it should “see through” demand shocks by tolerating higher (or lower) inflation. In theory, this has much to recommend it. In practice, it can be very difficult to distinguish between demand-side