14.4: From Policy Decision to Economic Outcome- The Transmission Mechanism
- Page ID
- 288004
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How does a change in the IORB rate affect the broader economy? The chain of casualty starts with bank behavior. A higher IORB raises the return on reserves, prompting banks to adjust other rates upward, including deposit and loan rates. This slows borrowing and cools economic activity. Conversely, a lower IORB lowers the return on reserves which leads to banks adjusting rates downward.
The culmination of these effects influences aggregate demand. Figure 4 shows how a rate hike can lead to reduced investment (I), shifting aggregate demand to the left, ultimately leading to lower output and prices. Recall that aggregate demand (AD) is comprised of consumer demand (C), investment demand (I), demand for government goods and services (G) and net exports (NX).
Figure 4
Changes in interest rates also affect asset prices (like stocks). For instance, higher interest rates may depress stock prices, curbing wealth-driven consumption.
Not All Interest Rates Are Equal
The yield curve is a graph that shows the relationship between interest rates and the maturity of U.S. government debt, from very short-term instruments like Treasury bills to long-term bonds like the 10-year Treasury note. Typically, the yield curve slopes upward, reflecting the fact that longer-term debt usually carries higher interest rates to compensate investors for risks like inflation and uncertainty over time. The curve provides a snapshot of market expectations about interest rates, economic growth, and inflation. See figure 5.
Figure 5
When the Federal Reserve changes the Interest on Reserve Balances (IORB), it affects short-term interest rates almost immediately. Rates such as the federal funds rate, overnight repurchase (repo) rates, and yields on short-term Treasury bills all tend to move in response. However, these changes do not always ripple out to longer-term rates. For instance, rates on 10-year or 30-year Treasury bonds, as well as mortgage rates and corporate bond yields, might remain steady if investors believe inflation will stay low or economic growth will slow down. This disconnect can weaken the impact of monetary policy.
If the Fed raises the IORB rate, the hope is that this will also impact long-term rates, and the yield curve will shift upward. See figure 6.
Figure 6
Sometimes, the Fed raises the IORB rate with little to no impact on long-term rates. When this happens, economists say the yield curve has flattened. See Figure 7.
Figure 7
The Fed relies on a loose relationship between short- and long-term interest rates to influence broader economic activity. The idea is that by adjusting short-term rates, long-term rates will eventually follow, thereby affecting consumer borrowing, business investment, and overall demand. When long-term rates drop, for example, mortgage and auto loan rates decline, encouraging spending. But if long-term rates remain unresponsive, the shift in the aggregate demand (AD) curve may be minimal. This uncertainty makes monetary policy a blunt tool (powerful, but far from precise or guaranteed in its effects).
Conclusion
Today’s monetary policy is less about "how much money" is in the system and more about "what price" money carries. The Fed's use of administered rates, particularly the IORB, reflects this modern approach. Understanding this shift is crucial for interpreting policy decisions, forecasting economic conditions, and educating the next generation of economists.
By focusing on the operational reality of monetary policy in the 21st century, students will gain a more accurate and functional understanding of how central banking shapes the macroeconomy.