25 Haziran 2025 Çarşamba

Interest Rates and Inflation: Cause or Effect?

The relationship between interest rates and inflation is one of the most divisive topics separating economists and politicians. These two concepts are often manipulated in political discourse, particularly by populist leaders who seek to assign blame. As a result, we frequently hear claims such as “high interest rates are the cause of inflation,” even though this view overlooks key economic realities.

What Are Interest and Inflation?

Interest is the cost of borrowing money — essentially, the price of using capital over time. In economic terms, it is the rate that balances the supply and demand for money.

Inflation, on the other hand, refers to a sustained increase in the general price level within an economy. It typically arises when aggregate demand exceeds aggregate supply. As spending increases and supply struggles to keep up, prices begin to rise across the board.

Does Interest Cause Inflation or the Other Way Around?

This question has long divided economic theory. Some schools — notably Neo-Fisherian economists — argue that rising interest rates cause inflation via the cost channel. According to this view, when borrowing costs rise, businesses pass these costs on to consumers in the form of higher prices.

While this model might appear to work in certain developed economies under specific conditions, it fails to account for the complexities of emerging markets like Turkey — where dollarization, exchange rate volatility, weak institutional credibility, and fragile consumer confidence are critical factors influencing inflationary dynamics.

Short-Term Effects: Inflationary Pressure

Indeed, in the short term, an increase in interest rates can raise costs. Businesses borrowing at higher rates will likely pass those costs on to consumers. For example, if mortgage rates spike to 30%, construction firms may raise home prices to maintain margins.

This may give the impression that high interest rates “cause” inflation — but this effect is often temporary.

Medium to Long-Term Effects: Rebalancing the Economy

Over the medium term, higher interest rates tend to reduce borrowing and spending. This leads to a decline in aggregate demand, easing inflationary pressure. In this sense, interest rate hikes serve a corrective function, cooling down an overheating economy.

To summarize the process:

Higher interest → Lower demand → Less price pressure → Inflation falls

Therefore, while interest rate hikes may appear inflationary at first, they are in fact a crucial tool for achieving long-term price stability.

What Happens When Interest Rates Are Artificially Suppressed?

One of the biggest risks in economic policy is the artificial suppression of interest rates. When rates are kept too low despite rising inflation, demand remains strong while access to funding becomes distorted. The result? An overheated economy, rising imports, weakening currency, and ultimately, runaway inflation.

Turkey’s experience during 2021–2022 is a prime example. Despite falling policy rates, inflation soared — peaking above 80% by mid-2022. Why? Because credit-driven demand remained strong, the lira depreciated sharply, and price expectations became unanchored.

Conclusion: From Political Rhetoric to Economic Reality

The interest-inflation relationship cannot be reduced to simplistic cause-effect logic. Economic outcomes depend on timing, structural context, and market confidence. Yes, high interest rates may seem painful — especially for borrowers and investors — but suppressing them in defiance of inflationary trends often leads to worse outcomes.

Ultimately, successful economic management requires looking beyond short-term costs, restoring policy credibility, and acknowledging that inflation control is not a political preference but an economic necessity.

High interest rates may create short-term inflationary pressure.
But suppressed interest rates allow long-term inflation to spiral.

Navigating this delicate balance is not just about numbers — it’s about trust, transparency, and discipline.


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