The way that the RBA influences the amount of funds held in ESA's is by selling and buying existing Australian government securities to and from the banks
Exchange Settlement Accounts (ESA)
How providers of payments services settle obligations that have accrued in the clearing
Decreasing the cash rate - Loosening Monetary Policy
The RBA will buy securities from commercial banks and exchange additional deposit funds in their ESA's. This will increase the supply of settlement funds, putting a downward pressure on the overnight cash rate.
When the RBA sells securities to a bank, it withdrawals money from the seller's ESA, subtracting from total ESA balances. This decreases the supply of settlement funds, putting an upward pressure on the overnight cash rate.
RBA Intervention in Short-term Money Market
The RBA constantly intervenes to maintain the cash rate at its target level
Increase in Cash Rate
Makes it more expensive for financial institutions to obtain funds in the short-term money market. This increases the overall cost structure of borrowing, flowing through to longer-term and mortgage interest rates as banks attempt to maintain profit margins
Reduction in Cash Rate
Lowers the cost of borrowing for banks in the short-term money market. Leads to lower lending interest rates.
Decrease in Interest Rates
Encourages consumption and investment spending, increasing level of economic activity
Increase in Interest Rates
Deters consumption and investment spending, reducing overall level of economic activity