Answer:
Volatility in investment spending, monetary policy
Explanation:
Classical economists believe that the economy is always capable of attaining the natural level of real GDP or output, which is the level of real GDP that is obtained when the resources found in the economy are fully employed.
A monetarist is an economist who holds a firm belief that the money supply, which includes physical currency, deposits and credit, is the primary factor affecting demand in an economy. Consequently, the performance of the economy, its growth, can be regulated by changes in the money supply.