Changes in monetary policy occur when the Federal Reserve adjusts business laws to affect the money supply.
changes taxation levels to affect the economy.
changes spending levels to affect the economy.
adjusts interest rates to affect the money supply.

Changes in monetary policy occur when the Federal Reserve  adjusts interest rates to affect the money supply.

Explanation:

Monetary policy is one of the two parts in which economic policy is generally divided, the other part being fiscal policy. Monetary policy is about how much money should be in the economy and how high the interest rate should be. Monetary policy can be governed by the country's government or the country's central bank, the Federal Reserve. In most countries, the role of monetary policy is to try to ensure that the economy grows at a steady pace and that inflation is kept down.

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