Using a comprehensive database on bank credit, covering 135 developing countries over the period 1960–2011, we identify, document, and compare the macro-economic dynamics of credit booms across low- and middle-income countries. The results suggest that while the duration and magnitude of credit booms is similar across country groups, macro-economic dynamics differ somewhat in low-income countries. We further find that surges in capital inflows are associated with credit booms. Moreover, credit booms associated with banking crises exhibit distinct macroeconomic dynamics, while also reflecting a potentially large deviation of credit from country fundamentals. These results suggest that low-income countries should remain mindful of the inter-linkages between financial liberalization, increased cross-border banking activities, and rapid credit growth.

How financial crises are inherent features of macroeconomic dynamics There are no bigger disruptions in the functioning of economies than financial crises. Yet prior to the crash of 2007–2008, macroeconomics incorporated financial crises simply as bad shocks, like earthquakes, failing to consider them as an intrinsic phenomenon of the evolution of macroeconomic variables, such as credit, investment, and productivity. Macroeconomics and Financial Crises rethinks how technological change, credit booms, and endogenous information production combine to generate financial crises as inherent and recurrent reactions to macroeconomic dynamics. Gary Gorton and Guillermo Ordoñez identify short-term debt, collateral, and information as common elements that are present in all financial crises. Short-term debt is a critical element for storing value over short periods without fear of loss, but there needs to be collateral backing the debt. Critically, the collateral should be such that no agent wants to produce information about its quality. The debt backed by such collateral is information-insensitive. Gorton and Ordoñez argue that, during a credit boom, as more and more firms get loans, the economy reaches a tipping point where information production becomes too tempting, disrupting short-term debt and cutting most firms out of the credit market. Showing how a financial crisis is an information event triggered by the dynamics of macroeconomic variables, Macroeconomics and Financial Crises provides new perspectives on the intricate relations between macroeconomics and financial crises.

We study the characteristics of credit booms in emerging and industrial economies. Macro data show a systematic relationship between credit booms and economic expansions, rising asset prices, real appreciations and widening external deficits. Micro data show a strong association between credit booms and leverage ratios, firm values, and banking fragility. We also find that credit booms are larger in emerging economies, particularly in the nontradables sector; most emerging markets crises are associated with credit booms; and credit booms in emerging economies are often preceded by large capital inflows but not by financial reforms or productivity gains.

This note explores the costs and benefits of different policy options to reduce the risks associated with credit booms, drawing upon several country experiences and the findings from econometric analysis.

Analysis and evidence of how the factors that give rise to boom-bust cycles in fast-growing developing economies also enhance long-run growth. The volatility that has hit many middle-income countries (MICs) after liberalizing their financial markets has prompted critics to call for new policies to stabilize these boom-bust cycles. But, as Aaron Tornell and Frank Westermann point out in this book, over the last two decades most of the developing countries that have experienced lending booms and busts have also exhibited the fastest growth among MICs. Countries with more stable credit growth, by contrast, have exhibited, on average, lower growth rates. Factors that contribute to financial fragility thus appear, paradoxically, to be a source of long-run growth as well. Tornell and Westermann analyze boom-bust cycles in the developing world and discuss how these cycles are generated by credit market imperfections. They explain why the financial liberalization that allows countries to overcome imperfections impeding rapid growth also generates the financial fragility that leads to greater volatility and occasional crises. The conceptual framework they present illustrates this linkage and allows Tornell and Westermann to address normative questions regarding liberalization policies.The authors also characterize key macroeconomic regularities observed across MICs, showing that credit markets play a key role not only in boom-bust episodes but in the strong "credit channel" observed during tranquil times. A theoretical framework is then presented that explains how credit market imperfections can account for these empirical patterns. Finally, Tornell and Westermann provide microeconomic evidence on the credit market imperfections that drive the results of the theoretical framework, finding that asymmetries between tradables and nontradables are key to understanding the patterns in MIC data.

This paper reviews the literature on financial crises focusing on three specific aspects. First, what are the main factors explaining financial crises? Since many theories on the sources of financial crises highlight the importance of sharp fluctuations in asset and credit markets, the paper briefly reviews theoretical and empirical studies on developments in these markets around financial crises. Second, what are the major types of financial crises? The paper focuses on the main theoretical and empirical explanations of four types of financial crises—currency crises, sudden stops, debt crises, and banking crises—and presents a survey of the literature that attempts to identify these episodes. Third, what are the real and financial sector implications of crises? The paper briefly reviews the short- and medium-run implications of crises for the real economy and financial sector. It concludes with a summary of the main lessons from the literature and future research directions.

Episodes of rapid credit growth, especially credit booms, tend to end abruptly, typically in the form of financial crises. This paper presents the findings of a comprehensive event study focusing on 99 credit booms. Loose monetary policy stances seem to have contributed to the build-up of credit booms across both advanced and emerging economies. In particular, domestic policy rates were below trend during the pre-peak phase of credit booms and likely fuelled macroeconomic and financial imbalances. For emerging economies, while credit booms are associated with episodes of large capital inflows, international interest rates (a proxy for global liquidity) are virtually flat during these periods. Therefore, although external factors such as global liquidity conditions matter, and possibly increasingly so over time, domestic factors (especially monetary policy) also appear to be important drivers of real credit growth across emerging economies.

All types of recessions, on average, not just those associated with financial and political crises (as in Cerra and Saxena, AER 2008), lead to permanent output losses. These findings have far-reaching conceptual and policy implications. A new paradigm of the business cycle needs to account for shifts in trend output and the puzzling inconsistency of output dynamics with other cyclical components of production. The ‘output gap’ can be ill-conceived, poorly measured, and inconsistent over time. Persistent losses require more buffers and crisis-avoidance policies, affecting tradeoffs in prudential, macroeconomic, and reserve management policies. The frequency and depth of crises are key determinants of long-term growth and drive a new stylized model of economic development.

This paper studies episodes in which aggregate bank credit contracts alongside expanding economic activity—credit reversals. Using data for 179 countries during 1960‒2017, the paper finds that reversals are a relatively common phenomenon--on average, they occur every five years. By comparison, banking crises take place every eight years on average. Credit reversals and banking crises also appear related to each other: reversals become more likely in the aftermath of banking crises, while the likelihood of crises drops following reversals. In terms of foregone economic activity, reversals are shown to be very costly, at about two-thirds of the costs of banking crises after taking into account their relative frequencies.