What term refers to the RBA's actions to influence the cost and availability of money?

The term that refers to the RBA's actions to influence the cost and availability of money is indeed Monetary Policy. This involves the use of interest rates, open market operations, and other tools to manage the supply of money in the economy, aiming to achieve macroeconomic objectives such as controlling inflation, stabilizing the currency, and fostering conditions for economic growth.

Monetary policy is primarily concerned with how the central bank, in this case, the Reserve Bank of Australia (RBA), adjusts the monetary base, affects interest rates, and ultimately influences economic activity. By setting interest rates, the RBA can either encourage borrowing and investment when rates are low or cool off the economy by raising rates to control inflation.

The other terms do not apply in the same context. Fiscal Policy involves government spending and taxation decisions rather than central bank operations, Banking Policy typically pertains to the regulations and operational guidelines governing financial institutions, and Regulatory Policy focuses on the rules and guidelines established for economic conduct rather than the monetary dynamics managed by a central bank like the RBA.