Short Answer
The central bank of Country A uses open market purchases to increase the money supply, which lowers nominal interest rates and encourages borrowing. This stimulates investment spending, boosts aggregate demand, and promotes economic growth, while potentially lowering reserve requirements for banks to enhance lending capacity.
Step 1: Open Market Purchase
The central bank of Country A will initiate an open market purchase to address the decline in investment expenditure. This involves buying government securities from financial institutions. As a result, more funds are made available in the banking system, which helps to accelerate economic activity.
Step 2: Adjusting the Money Market Graph
By conducting open market purchases, the money supply increases, shown by a rightward shift in the demand curve on the money market graph. This shift lowers the nominal interest rate, making borrowing cheaper. A lower interest rate encourages businesses and consumers to take loans for investment and spending, effectively stimulating the economy.
Step 3: Motivating Investment Spending
A reduced nominal interest rate will likely lead to an increase in investment spending, which in turn boosts aggregate demand in the short term. If banking institutions have enough reserves, the central bank can lower the reserve requirements, providing banks with more money to lend. This further supports the cycle of investment and economic growth.