Sterilized Intervention

DEFINITION of 'Sterilized Intervention'

The purchase or sale of foreign currency by a central bank to influence the exchange value of the domestic currency, without changing the monetary base. Sterilized intervention involves two separate transactions: 1) the sale or purchase of foreign currency assets, and 2) an open market operation involving the purchase or sale of U.S. government securities (in the same size as the first transaction). The open market operation effectively offsets or sterilizes the impact of the intervention on the monetary base. If the sale or purchase of the foreign currency is not accompanied by an open market operation, it would amount to an unsterilized intervention. Empirical evidence suggests that sterilized intervention is generally incapable of altering exchange rates.

BREAKING DOWN 'Sterilized Intervention'

Consider a simple example of sterilized intervention. Assume that the Federal Reserve is concerned about the weakness of the dollar against the euro. It therefore sells euro-denominated bonds in the amount of EUR 10 billion, and it receives $14 billion in proceeds from the bond sale. Since the withdrawal of $14 billion from the banking system to the Federal Reserve would affect the federal funds rate, the Federal Reserve will immediately conduct an open market operation and buy $14 billion of U.S. Treasuries. This injects the $14 billion back into the monetary system, sterilizing the sale of the euro-denominated bonds. The Federal Reserve in effect also shuffles its bond portfolio by exchanging euro-denominated bonds for U.S. Treasuries.

The U.S. Treasury department is responsible for determining the nation’s exchange rate, and for that purpose, it maintains the Exchange Stabilization Fund, which is a portfolio of foreign currency and dollar-denominated assets. The Federal Reserve also has a foreign currency portfolio for the same purpose. Exchange rate intervention is carried out jointly by the Treasury and Federal Reserve.

One of the main tools used by the Federal Reserve to influence monetary policy is its target for the federal funds rate, which is set by the Federal Open Market Committee primarily to achieve domestic objectives. Since the Federal Reserve would never permit its intervention activities to have an impact on its monetary policy operations, it always uses sterilized intervention. Central banks of major nations – such as the Bank of Japan and the European Central Bank – which also use an overnight interest rate as a short-term operating target, likewise sterilize their currency interventions.

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