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The process the Reserve Bank uses to influence the cash rate of interest
The process the Reserve Bank of Australia uses to influence the cash rate of interest is called Domestic Market Operations (DMO) and is the instrument of government monetary policy.
DMO is the purchase and sale of second hand government securities by the Reserve Bank. The RBA's domestic market operations determine the aggregate supply of Exchange Settlement (ES) funds and are designed to ensure that supply equals demand at the target cash rate. If the supply is too high, holders of ES funds will wish to lend their excess funds in the overnight market, putting downward pressure on the cash rate. If the supply is too low, they will wish to borrow, putting upward pressure on the rate. When the supply of funds held in the official short term money market increases, the price of borrowing this money, which is the cash rate, falls.
The Board of the Reserve Bank determines the target cash rate at its monthly meeting and any changes in the rate are announced at 9.30am, typically on the day after the Board meeting. The RBA's open market operations are designed to ensure that the actual cash rate remains close to the target rate.
The RBA cash rate influences the general level of interest rates. An increase in the cash rate means it’s more expensive for financial institutions to obtain funds in the short term market, and increases interest rates. A reduction in the cash rate lowers the cost of borrowing for banks in the short term market, and then financial institutions lower lending interest rates.
The RBA has direct control over the supply of funds in the over night money market. When the RBA sells government securities to banks, there is a shortage of borrowable funds with leads to an increase in the cash rate. To maintain margins banks increase market interest rates and consumers and business have to pay more on existing debts. Consumption and investment spending decreases, leading to a decrease in economic activity. This is the tightening of the monetary policy.
When the RBA buys government securities there is an excess of borrowable funds, therefore the cash rate decreases. To maintain margins banks decrease market interest rates and consumers and business have to pay less on existing debts or new borrowers find it easier to borrow funds. Consumption and investment spending increase because of the lower interest rates and economic activity increases because of higher consumer spending. This is the loosening of the monetary policy.