The cash received from these repos is used to create a liquidity buffer for «after - hours» payments (those initiated through the direct entry (DE) system or NPP after 16:45 AEST / AEDT on business days, and all NPP payments on weekends and public holidays); hence, the minimum positions are set with regard to the potential size of these payments. (rba.gov.au)
In other words, it's highly important to know for sure how much money you spend, what is your balance, what is an interest rate you pay and when you should make payments on your loans and credit cards and the exact size of these payments. (personalmoneyservice.com)
The size of that payment depends mostly on your age and the level of interest rates. (money.cnn.com)