In May 2025, global inflation rates and central bank interest rates showed significant variation across major economies. Most economies initiated interest rate cuts from mid-2024 due to declining inflationary pressures. The U.S., UK, and EU central banks followed a consistent pattern of regular rate reductions throughout late 2024. In early 2025, Russia maintained the highest interest rate at 20 percent, while Japan retained the lowest at 0.5 percent. Varied inflation rates across major economies The inflation landscape varies considerably among major economies. China had the lowest inflation rate at -0.1 percent in May 2025. In contrast, Russia maintained a high inflation rate of 9.9 percent. These figures align with broader trends observed in early 2025, where China had the lowest inflation rate among major developed and emerging economies, while Russia's rate remained the highest. Central bank responses and economic indicators Central banks globally implemented aggressive rate hikes throughout 2022-23 to combat inflation. The European Central Bank exemplified this trend, raising rates from 0 percent in January 2022 to 4.5 percent by September 2023. A coordinated shift among major central banks began in mid-2024, with the ECB, Bank of England, and Federal Reserve initiating rate cuts, with forecasts suggesting further cuts through 2025 and 2026.

The enduring discourse regarding the effectiveness of interest rate policy in mitigating inflation within developing economies is characterized by the interplay of structural and supply-side determinants. Moreover, extant academic literature fails to resolve the direction of causality between inflation and interest rates. Nevertheless, the prevalent adoption of interest rate-based monetary policies in numerous developing economies raises a fundamental inquiry: What motivates central banks in these nations to consistently espouse this strategy? To address this inquiry, our study leverages wavelet transformation to dissect interest rate and inflation data across a spectrum of frequency scales. This innovative methodology paves the way for a meticulous exploration of the intricate causal interplay between these pivotal macroeconomic variables for twenty-two developing economies using monthly data from 1992 to 2022. Traditional literature on causality tends to focus on short- and long-run timescales, yet our study posits that numerous uncharted time and frequency scales exist between these extremes. These intermediate scales may wield substantial influence over the causal relationship and its direction. Our research thus extends the boundaries of existing causality literature and presents fresh insights into the complexities of monetary policy in developing economies. Traditional wisdom suggests that central banks should raise interest rates to combat inflation. However, our study uncovers a contrasting reality in developing economies. It demonstrates a positive causal link between the policy rate and inflation, where an increase in the central bank’s interest rates leads to an upsurge in price levels. Paradoxically, in response to escalating prices, the central bank continues to heighten the policy rate, thereby perpetuating this cyclical pattern. Given this observed positive causal relationship in developing economies, central banks must explore structural and supply-side factors to break this cycle and regain control over inflation.

Canada's inflation rate experienced significant fluctuations from 2018 to 2025. Inflation peaked at *** percent in June 2022 before steadily declining to *** percent by December 2024. In early 2025, inflation began to increase again, rising to *** percent in February, and dropping to *** percent in March. In response to rising inflation between 2020 and 2022, the Bank of Canada implemented aggressive interest rate hikes. The bank rate reached a maximum of **** percent in July 2023 and remained stable until June 2024. As inflationary pressures eased in the second half of 2024, the central bank reduced interest rates to *** percent in December 2024. In 2025, the bank rate witnessed two cuts, standing at ***** percent in May 2025. This pattern reflected broader global economic trends, with most advanced and emerging economies experiencing similar inflationary challenges and monetary policy adjustments. Global context of inflation and interest rates The Canadian experience aligns with the broader international trend of central banks raising policy rates to combat inflation. Between 2021 and 2023, nearly all advanced and emerging economies increased their central bank rates. However, a shift occurred in the latter half of 2024, with many countries, including Canada, beginning to lower rates. This change suggests a new phase in the global economic cycle and monetary policy approach. Notably, among surveyed countries, Russia maintained the highest interest rate in early 2025, while Japan had the lowest rate. Comparison with the United States The United States experienced a similar trajectory in inflation and interest rates. U.S. inflation peaked at *** percent in June 2022, slightly higher than Canada's peak. The Federal Reserve responded with a series of rate hikes, reaching **** percent in August 2023. This rate remained unchanged until September 2024, when the first cut since September 2021 was implemented. In contrast, Canada's bank rate peaked at **** percent and began decreasing earlier, with cuts in June and July 2024. These differences highlight the nuanced approaches of central banks in managing their respective economies amid global inflationary pressures.

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