Monetary Transmission Mechanism

The monetary transmission mechanism is the process by which changes in the stance of monetary policy affect the economy, including output and prices. The mechanism operates through several channels, which differ in their speed and in their importance.

Interest Rate Channel

The interest rate channel operates through the effect of the policy rate on the rates faced by households and firms. A change in the policy rate is transmitted to the lending and deposit rates, which affect the cost of borrowing and the return to saving.

A reduction in the policy rate lowers the cost of borrowing, which encourages investment and consumption. It also lowers the return to saving, which reduces the incentive to save. The effect on demand depends on the responsiveness of investment and consumption to interest rates.

Credit Channel

The credit channel operates through the effect of monetary policy on the supply of credit by banks and other financial institutions. A tightening of policy reduces the reserves of banks, which may reduce their willingness to lend, particularly to borrowers who depend on bank credit.

The credit channel has two components. The bank lending channel operates through the supply of loans by banks, while the balance sheet channel operates through the effect of policy on the financial position of borrowers. A tightening of policy worsens the financial position of borrowers, which raises the cost of external finance and reduces their access to credit.

Asset Price Channel

The asset price channel operates through the effect of monetary policy on the prices of assets, including equities and real estate. A reduction in the policy rate raises the prices of assets, which raises the wealth of households and lowers the cost of capital for firms.

The effect on wealth raises consumption, through the wealth effect, and the effect on the cost of capital raises investment. The asset price channel is therefore an important element of the transmission mechanism.

Exchange Rate Channel

The exchange rate channel operates through the effect of monetary policy on the exchange rate. A reduction in the policy rate lowers the return on domestic assets, which reduces the demand for the domestic currency and causes it to depreciate.

The depreciation raises the price of imports and lowers the price of exports, which raises net exports and thereby demand. The effect on inflation depends on the degree of pass-through of the exchange rate to import prices.

Expectations Channel

The expectations channel operates through the effect of monetary policy on the expectations of households and firms. A credible commitment to a policy stance affects expectations about future inflation and interest rates, which in turn affect current behaviour.

The expectations channel is particularly important when the policy rate is at its lower bound, since the central bank can influence expectations through forward guidance and through asset purchases. The effectiveness of the channel depends on the credibility of the central bank and on the anchoring of expectations.

The Role of the Financial System

The financial system plays a central role in the transmission of monetary policy. The structure of the system, including the importance of banks relative to markets, affects the channels through which policy operates.

In a system where banks are the main source of finance for firms and households, the credit channel is important, and the effect of policy on the supply of bank credit matters. In a system where markets are more important, the asset price channel and the interest rate channel may dominate.

The condition of the financial system also matters. A weakened banking system may be unable to transmit the policy stimulus, since the banks may be reluctant to lend even when the policy rate is low. The impairment of the transmission mechanism was a feature of the period after the financial crisis.

Unconventional Monetary Policy

Unconventional monetary policy refers to the measures taken by central banks when the policy rate is at its lower bound. The measures include quantitative easing, in which the central bank purchases assets to inject liquidity and to lower long-term interest rates, and forward guidance, in which the central bank communicates its intentions about the future path of policy.

The measures operate through the transmission mechanism, though the channels differ from those of conventional policy. Quantitative easing works through the asset price channel and the portfolio balance channel, by changing the composition of the assets held by the private sector. Forward guidance works through the expectations channel, by influencing expectations about future rates.

The effectiveness of the measures is a subject of research. The evidence suggests that they have lowered long-term interest rates and supported demand, though the effects are uncertain and may depend on the circumstances.

The Transmission Mechanism in Emerging Markets

The transmission mechanism in emerging markets differs from that in advanced economies. The channels are affected by the structure of the financial system, by the degree of openness of the economy, and by the credibility of the monetary authority.

In emerging markets, the exchange rate channel may be more important, since the economies are more open and the exchange rate is more sensitive to interest rate changes. The credit channel may also be more important, since the banking system is often the dominant source of finance.

The transmission mechanism is also affected by the presence of foreign currency debt, which can amplify the effects of exchange rate movements, and by the credibility of the monetary policy framework, which affects the response of expectations.

Summary

The monetary transmission mechanism is the process by which policy affects the economy, and it operates through several channels whose importance varies across economies and over time. The structure of the financial system, the use of unconventional measures, and the characteristics of emerging markets all shape the mechanism.

See also

• Monetary Economics
• Central Banking
• Interest Rate Spread