MMT considers that the aggregate demand impact of interest rate changes are unclear and may not even be negative (for a rise) or positive (for a fall) depending on rather complex distributional factors. For example, remember that rising interest rates represent both a cost and a benefit depending on which side of the equation you are on. Interest rate changes also influence aggregate demand – if at all – in an indirect fashion whereas government spending injects spending immediately into the economy.

This is the reason why MMT proponents do not give priority to monetary policy over fiscal policy.

SOURCE – BILL MITCHELL