Explanation

When a central bank increases its policy rate (such as the federal funds rate in the US), several economic mechanisms come into play that help reduce inflation:

1. Currency Appreciation Effect

• Higher interest rates make domestic assets more attractive to foreign investors
• This increases demand for the domestic currency, causing it to appreciate
• A stronger currency makes imports cheaper and exports more expensive
• Cheaper imports directly reduce import prices, which lowers overall inflation
• More expensive exports reduce demand for domestic goods, slowing economic activity

2. Why Other Options Are Incorrect

Option A (increasing consumption growth):

• Higher interest rates typically REDUCE consumption growth, not increase it
• Higher borrowing costs discourage consumer spending on credit
• Higher savings rates encourage saving rather than spending
• Reduced consumption growth helps lower inflation, but this is not the mechanism described

Option B (improving investors' confidence):

• While higher rates might signal central bank commitment to fighting inflation
• This effect is indirect and not the primary transmission mechanism
• Investor confidence could actually decrease if higher rates slow economic growth too much

3. Additional Transmission Mechanisms

While currency appreciation is a key mechanism, higher policy rates also:

1. Increase borrowing costs for businesses and consumers
2. Reduce investment spending due to higher capital costs
3. Slow economic growth overall
4. Reduce aggregate demand in the economy

4. Real-World Context

This mechanism is particularly important in open economies where:

• Trade represents a significant portion of GDP
• The exchange rate channel is a powerful transmission mechanism
• Central banks consider currency effects when setting monetary policy

Therefore, option C correctly identifies the currency appreciation channel as a key mechanism through which higher policy rates exert downward pressure on domestic inflation.