Monetarists argue about the ineffectiveness of the fiscal policy because the crowding-out effect leads to a reduction in investment.
Option B is the correct answer.
Monetarism is a theory of macroeconomics where the money supply variates in respect of economic variables like production volume, market prices, employment factors, etc.
The crowding-out effect creates the engagement of the government in the market due to which rates of interest are goes on rising which ultimately leads to a downfall in the investment by private entities. As a result, the fiscal policy of the government becomes ineffective.
Therefore, the crowding-out effect results in the ineffectiveness of the fiscal policy as argued by the Monetarists.
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