[News Terms in 5 Minutes] What is 'Behind the Curve' (Central Bank's Delay in Raising Rates)?

Recently, we have been hearing the phrase “Isn’t the Bank of Japan behind the curve?” more often in economic news.
“I know it means that interest rate hikes are slow, but I might struggle if I had to explain it…”
In this article, we will quickly break down what ‘behind the curve’ means in 5 minutes.

💡 What exactly is ‘behind the curve’?

Behind the Curve is a term that refers to a situation where a central bank’s monetary policy is not keeping up with movements in prices or the economy. It is often used to describe a situation where interest rate hikes are delayed despite rising inflation.

Literally translated, it means ‘being behind the curve.’ The ‘curve’ here is said to represent the trajectory of inflation or economic activity. To use an analogy, it is similar to falling behind while chasing a ball that has started rolling down a hill, forcing you to run at full speed later to catch up.

Conversely, taking preemptive action before prices rise completely is called ‘Ahead of the Curve’.

📰 Why is it a hot topic now?

The trigger was a recent statement by Bank of Japan Governor Kazuo Ueda. At a press conference following the G20 meeting on October 16, 2026, the Governor indicated that the underlying inflation rate was ‘approaching 2% significantly,’ and emphasized the stance of continuing to raise interest rates, stating that any further upward deviation could not be tolerated (the Bank of Japan published a summary of his remarks on October 20).

The Governor further stated that if the market perceives that the adjustment of short-term interest rates is delayed, ‘long-term interest rates could rise.’ It could be said that the head of the central bank touched almost directly on the risk of being behind the curve.

The background includes the following figures:

• The Bank of Japan raised its policy interest rate from 1.00% to 1.25% at its meeting on September 17-18, 2026 (the first time in three months since June)

• – The dollar-yen exchange rate is around 158 yen to the dollar as of October 20, with the yen remaining at a weak level

• – The U.S. 10-year Treasury yield is around 5%, which is in the high range seen since 2007

On the other hand, there are reports that the Bank of Japan is cautious about raising interest rates for two consecutive meetings. Ahead of the Bank of Japan meeting on October 29-30, it is observed that the view that ‘interest rates are still too low relative to prices’ is strengthening in some parts of the market.

🔍 Understanding the mechanism in 5 minutes

The reasons why being ‘behind the curve’ is a concern can be organized into three main points.

The first is that ‘real interest rates remain negative.’ If the inflation rate is around 2% and the policy interest rate is 1.25%, the real interest rate after subtracting inflation is negative. It is said that the state where it is easy to borrow money continues, and the power to cool down prices remains weak.

The second is that ‘inflation expectations will rise.’ If households and companies become convinced that ‘prices will continue to rise in the future,’ price hikes and wage increase demands will occur preemptively, making inflation more likely to become entrenched.

The third is that ‘a sudden emergency brake will be needed later.’ The longer the response is delayed, the larger the interest rate hike that will ultimately be required, which could lead to a greater blow to the economy.

A representative example often cited is the U.S. Federal Reserve in 2021-22. Initially, the Fed described inflation as ‘transitory.’ However, the U.S. CPI rose to 9.1% year-on-year in June 2022. The Fed finally began raising interest rates in March 2022, and subsequently implemented large interest rate hikes of 0.75% for four consecutive meetings. This ‘delay’ is often cited as a typical example of being behind the curve.

Note that long-term interest rates are rates determined by the market. If the market judges that ‘the central bank is lagging behind,’ long-term interest rates may rise first due to caution about future inflation. Governor Ueda’s remarks are considered to be pointing to this point.

🏠 How does it relate to our daily lives?

This term is actually quite relevant to household finances.

For example, consider ‘the weak yen and prices.’ If the Bank of Japan is perceived as being slow to raise interest rates, it is said that the interest rate gap between Japan and the U.S. is less likely to narrow, making a weak yen more likely to persist. Since a weak yen pushes up the price of imports, it can lead to price hikes for everyday items like food, gasoline, and electricity bills.

Another example is ‘mortgage loans.’ Variable interest rates are designed to be easily linked to the Bank of Japan’s policy interest rate, while fixed interest rates are easily linked to long-term interest rates. If long-term interest rates rise due to concerns about being ‘behind the curve,’ fixed-rate loans could be affected first. And if interest rates are then raised in a hurry later on, the burden on variable-rate loans might also increase.

In other words, I think the key point is that ‘slow interest rate hikes’ do not necessarily mean ‘friendly to loans,’ and there is a risk that the delay could come back to haunt us all at once later on. ## 🔮 What will happen from here? The immediate focus is on the results of the FOMC (U.S. Federal Open Market Committee) on October 28 and the Bank of Japan meeting on October 29-30. If the Bank of Japan decides to hold off on additional interest rate hikes, the market’s view of being ‘behind the curve’ may strengthen further, potentially leading to a weaker yen and higher long-term interest rates.

On the other hand, there are many uncertain factors such as the situation in the Middle East, the future of AI-related demand, and currency movements, so it is believed that the Bank of Japan will assess the situation carefully. Since there is also a risk that raising interest rates too quickly could cool the economy too much, it is said that the difficulty of steering the ship—’not too fast, not too slow’—will continue for some time.

💬 A word from a working mom

To be honest, I had been ignoring the term ‘behind the curve’ until now. But when I looked it up, I realized it is directly linked to price hikes at the supermarket and mortgage interest rates.

What personally left an impression on me was the point that ‘if interest rate hikes are slow, a sudden, collective brake will be applied later.’ As someone with a mortgage, I tend to think, ‘I don’t want interest rates to go up’ whenever I hear news about rate hikes. But since it is also hard on household finances for prices to keep rising, I feel it is not easy to say which is better.

At the Bank of Japan meeting at the end of the month, I want to pay attention not only to the results but also to how the Governor explains whether they are ‘keeping up with prices.’ My family also intends to use this timing to review the balance between fixed and variable rates and our monthly fixed costs.