Scott Sumner suggests that NGDP targeting is a far more conservative approach than the current inflation targeting practiced by the Fed and many other central banks:
Most of the blogging Market Monetarists have their roots in a strong free market tradition and nearly all of us would probably describe ourselves as libertarians or classical liberal economists who believe that economic allocation is best left to market forces. Therefore most of us would also tend to agree with general free market positions regarding for example trade restrictions or minimum wages and generally consider government intervention in the economy as harmful.
I think that NGDP targeting is totally consistent with these general free market positions – in fact I believe that NGDP targeting is the monetary policy regime which best ensures well-functioning and undistorted free markets.
And here explains why inflation is not a threat under NGDP targeting:
Inflation will be higher under NGDP targeting. This is obviously wrong. Over the long-run the central bank can choose whatever inflation rate it wants. If the central bank wants 2% inflation as long-term target then it will choose an NGDP growth path, which is compatible which this. If the long-term growth rate of real GDP is 2% then the central bank should target 4% NGDP growth path. This will ensure 2% inflation in the long run.
Read more at NGDP level targeting – the true Free Market alternative (we try again) | The Market Monetarist.