Person:
Kose, M. Ayhan

Prospects Group, The World Bank
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International macroeconomics, International finance
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Prospects Group, The World Bank
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Last updated: August 22, 2024
Biography
Ayhan Kose is the Deputy Chief Economist of the World Bank Group and Director of the Prospects Group. He is a member of the Chief Economist’s leadership team overseeing the Bank’s analytical work, and policy and operational advice. He also leads the Bank’s work on the global macroeconomic outlook, financial flows, and commodity markets. Under his management, the Prospects Group produces the Bank’s flagship reports Global Economic Prospects and Commodity Markets Outlook, in addition to other policy and analytical publications. Prior to joining the World Bank, he was Assistant to the Director of the Research Department and Deputy Chief of the Multilateral Surveillance Division in the International Monetary Fund (IMF). He served in a wide range of roles supporting IMF’s analytical, policy, and operational work. Mr. Kose is a Nonresident Senior Fellow at the Brookings Institution, a Dean’s Fellow at the University of Virginia’s Darden School of Business, a Research Fellow at the Center for Economic Policy Research (CEPR), and a Research Associate at the Center for Applied Macroeconomics (CAMA). He taught at the University of Chicago’s Booth School of Business, INSEAD, and Brandeis International Business School. He has a Ph.D. in economics from the Tippie College of Business at the University of Iowa and a B.S. in industrial engineering from Bilkent University. A native of Turkey, Mr. Kose was born and raised in Istanbul.
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Now showing 1 - 7 of 7
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    Inflation in Emerging and Developing Economies: Evolution, Drivers and Policies
    (Washington, DC: World Bank, 2019) Ha, Jongrim; Kose, M. Ayhan; Ohnsorge, Franziska; Ha, Jongrim; Kose, M. Ayhan; Ohnsorge, Franziska; Ivanova, Anna; Laborde, David; Lakatos, Csilla; Martin, Will; Matsuoka, Hideaki; Montiel, Peter J.; Panizza, Ugo; Pedroni, Peter; Stocker, Marc; Unsal, Filiz D.; Vorisek, Dana; Yilmazkuday, Hakan
    Emerging market and developing economies, like advanced economies, have experienced a remarkable decline in inflation over the past half-century. Yet, research into this development has focused almost exclusively on advanced economies. This book fills that gap, providing the first comprehensive and systematic analysis of inflation in emerging market and developing economies. It examines how inflation has evolved and become synchronized among economies; what drives inflation globally and domestically; where inflation expectations have become better-anchored; and how exchange rate fluctuations can pass through to inflation. To reach its conclusions, the book employs cutting edge empirical approaches. It also offers a rich data set of multiple measures of inflation for a virtually global sample of countries over a half-century to spur further research into this important topic.
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    Understanding the Global Drivers of Inflation: How Important Are Oil Prices?
    (World Bank, Washington, DC, 2023-01) Ha, Jongrim; Kose, M. Ayhan; Ohnsorge, Franziska; Yilmazkuday, Hakan
    This paper examines the global drivers of inflation in 55 countries over 1970–2022. The paper estimates a Factor-Augmented Vector Autoregression model for each country and assess the importance of several global (demand, supply, and oil price) and domestic shocks. It reports three main results. First, global shocks have explained about 26 percent of inflation variation in a typical economy. Oil price shocks accounted for only about 4 percent of inflation variation, but they had a statistically significant impact on inflation in three-quarters of the countries. Second, global shocks have become more important in driving inflation variation over time. The share of inflation variance caused by oil price shocks increased from 4 percent prior to 2000 to roughly 9 percent during 2001–22. They also accounted for some of the steep runup in inflation between mid-2021 and mid-2022. Third, oil price shocks tended to contribute significantly more to inflation variation in advanced economies, countries with stronger global trade and financial linkages, commodity importers, net energy importers, countries without inflation-targeting regimes, and countries with pegged exchange rate regimes. The headline results are robust to a wide range of exercises—including alternative measures of global factors and oil prices—and aggregation of countries.
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    One-Stop Source: A Global Database of Inflation
    (World Bank, Washington, DC, 2021-07) Ha, Jongrim; Kose, M. Ayhan; Ohnsorge, Franziska
    This paper introduces a global database that contains inflation series: (i) for a wide range of inflation measures (headline, food, energy, and core consumer price inflation; producer price inflation; and gross domestic product deflator changes); (ii) at multiple frequencies (monthly, quarterly and annual) for an extended period (1970–2021); and (iii) for a large number (up to 196) of countries. As it doubles the number of observations over the next-largest publicly available sources, the database constitutes a comprehensive, single source for inflation series. The paper illustrates the potential use of the database with three applications. First, it studies the evolution of inflation since 1970 and document the broad-based disinflation around the world over the past half-century, with global consumer price inflation down from a peak of roughly 17 percent in 1974 to 2.5 percent in 2020. Second, it examines the behavior of inflation during global recessions. Global inflation fell sharply (on average by 0.9 percentage points) in the year to the trough of global recessions and continued to decline even as recoveries got underway. In 2020, inflation declined less, and more briefly, than in any of the previous four global recessions over the past 50 years. Third, the paper analyzes the role of common factors in explaining movements in different measures of inflation. While, across all inflation measures, inflation synchronization has risen since the early 2000s, it has been much higher for inflation measures that involve a larger share of tradable goods.
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    What Explains Global Inflation
    (World Bank, Washington, DC, 2023-12-21) Ha, Jongrim; Kose, M. Ayhan; Ohnsorge, Franziska; Yilmazkuday, Hakan
    This paper examines the drivers of fluctuations in global inflation, defined as a common factor across monthly headline consumer price index (CPI) inflation in G7 countries, over the past half-century. It estimates a Factor-Augmented Vector Autoregression model where a wide range of shocks, including global demand, supply, oil price, and interest rate shocks, are identified through narrative sign restrictions motivated by the predictions of a simple dynamic general equilibrium model. The authors report three main results. First, oil price shocks followed by global demand shocks explained the lion’s share of variation in global inflation. Second, the contribution of global demand and oil price shocks increased over time, from 56 percent during 1970–1985 to 65 percent during 2001–2022, whereas the importance of global supply shocks declined. Since the pandemic, global demand and oil price shocks have accounted for most of the variation in global inflation. Finally, oil price shocks played a much smaller role in global core CPI inflation variation, for which global supply shocks were the main source of variation. These results are robust to various sensitivity exercises, including alternative definitions of global variables, different samples of countries, and additional narrative restrictions.
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    Understanding Inflation in Emerging and Developing Economies
    (World Bank, Washington, DC, 2019-02) Ha, Jongrim; Kose, M. Ayhan; Ohnsorge, Franziska L.
    Emerging market and developing economies (EMDEs) have experienced an extraordinary decline in inflation since the early 1970s. After peaking in 1974 at 17.3 percent, inflation in these economies declined to 3.5 percent in 2017. Despite a checkered history of managing inflation among many EMDEs, disinflation occurred across all regions. This paper presents a summary of a recent book, "Inflation in Emerging and Developing Economies: Evolution, Drivers, and Policies," that analyzes this remarkable achievement. The findings suggest that many EMDEs enjoy the benefits of stability-oriented and resilient monetary policy frameworks, including central bank transparency and independence. Such policy frameworks need to be complemented by strong macroeconomic and institutional arrangements. Inflation expectations are more weakly anchored in EMDEs than in advanced economies. In EMDEs that do not operate inflation targeting frameworks, exchange rate movements tend to have larger and more persistent effects on inflation.
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    Global Inflation Synchronization
    (World Bank, Washington, DC, 2019-03) Ha, Jongrim; Kose, M. Ayhan; Ohnsorge, Franziska L.
    The paper studies the extent of global inflation synchronization using a dynamic factor model in a large set of countries over a half century. The authors' methodology allows them to account for differences across groups of countries (advanced economies and emerging market and developing economies) and to analyze commonalities in inflation synchronization across a wide range of inflation measures. The paper reports three major results. First, inflation movements have become increasingly synchronized internationally over time: a common global factor has accounted for about 22 percent of variation in national inflation rates since 2001. Second, inflation synchronization has also become more broad-based: while it was previously much more pronounced among advanced economies than among emerging market and developing economies, it has become substantial in both groups over the past two decades. In addition, inflation synchronization has become significant across all inflation measures since 2001, whereas it was previously prominent only for inflation measures that included mostly tradable goods.
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    Rate Cycles
    (Washington, DC: World Bank, 2024-08-22) Forbes, Kristin; Ha, Jongrim; Kose, M. Ayhan
    This paper analyzes cycles in policy interest rates in 24 advanced economies over 1970–2024, combining a new application of business cycle methodology with rich time-series decompositions of the shocks driving rate movements. “Rate cycles” have gradually evolved over time, with less frequent cyclical turning points, more moderate tightening phases, and a larger role for global shocks. Against this backdrop, the 2020–24 rate cycle has been unprecedented in many dimensions: it features the fastest pivot from active easing to a tightening phase, followed by the most globally synchronized tightening, and an unusually long period of holding rates constant. It also exhibits the largest role for global shocks—with global demand shocks still dominant, but an increased role for global supply shocks in explaining interest rate movements. Inflation and the growth in output and employment have, on average, largely returned to historical norms for this stage in a tightening phase. Any recalibration of interest rates going forward should be gradual, however, and account for the interactions between increasingly important global factors and domestic circumstances, combined with uncertainty as to whether rate cycles have reverted to pre-2008 patterns.