Juglar cycle

Juglar cycle. The Juglar cycle is a medium-term fluctuation in economic activity, traditionally identified as lasting approximately 7 to 11 years. First systematically described by the French physician and statistician Clément Juglar in the 19th century, it is characterized by recurrent phases of expansion, crisis, recession, and revival. This cycle is considered a fundamental component of business cycle theory, focusing on fixed investment in plant and equipment and inventory adjustments. Its identification marked a significant shift from viewing economic crises as random events to understanding them as periodic phenomena within capitalist economies.

Definition and characteristics

The cycle is defined by its periodicity and its distinct phases, which encompass the full rhythm of a business cycle. Its primary characteristic is the wave-like pattern in aggregate economic activity, measured by indicators such as gross domestic product, industrial production, and unemployment rates. The fluctuations are driven largely by cycles in business investment, particularly in capital goods and infrastructure, alongside shifts in credit availability from institutions like the Bank of England or the Federal Reserve. Unlike shorter inventory cycles, it involves longer-term commitments in manufacturing capacity and technological innovation, often culminating in a financial crisis or panic, such as the Panic of 1873.

Historical context and discovery

The concept emerged from the empirical work of Clément Juglar, who analyzed price series, interest rates, and banking statistics in his 1862 treatise *Des Crises Commerciales et de leur Retour Périodique en France, en Angleterre et aux États-Unis*. Juglar's research was influenced by earlier thinkers like John Stuart Mill and occurred amidst the economic turbulence of the 19th century, including the Long Depression. His work challenged the prevailing classical economics view, exemplified by Jean-Baptiste Say, that economies naturally tend toward equilibrium, instead documenting regular patterns of boom and bust. This analysis was later integrated into the broader framework of the Austrian School and other business cycle theories.

Phases of the cycle

The cycle progresses through four sequential phases. The **expansion** phase is marked by rising investment, increasing profits, easy credit from banks like J.P. Morgan & Co., and low unemployment, often leading to speculation in markets such as the New York Stock Exchange. This peaks into a **crisis** or upper turning point, frequently triggered by a monetary contraction or a failure of a major institution like Barings Bank, leading to a sharp downturn. The **recession** or contraction phase follows, characterized by falling output, deflation, bankruptcies like that of Penn Central Transportation Company, and rising unemployment. Finally, the **revival** or recovery phase begins, as inventories deplete, interest rates fall, and new investment in sectors like railroads or telegraphy slowly resumes.

Theoretical explanations

Various economic schools offer explanations for the cycle's recurrence. Joseph Schumpeter, in his work *Business Cycles*, championed an innovation-based theory, where clusters of technological change like the spinning jenny or Bessemer process drive investment surges and subsequent downturns. Monetarist theorists, including Milton Friedman, emphasize the role of money supply fluctuations and central bank policy errors. The Marxist economics tradition, following Karl Marx, views the cycle as an inherent contradiction of capitalism leading to overproduction and a falling rate of profit. Additionally, post-Keynesian economics focuses on the instability of investment decisions under conditions of fundamental uncertainty.

Relationship to other economic cycles

The cycle is part of a nested model of economic fluctuations, interacting with cycles of different durations. It is often considered to encompass roughly two or three shorter Kitchin cycles (3-5 years), which are related to inventory adjustments. Conversely, two or three Juglar cycles are thought to form one longer Kuznets swing (15-25 years), linked to demographic waves and infrastructure investment. Furthermore, multiple Juglar cycles are embedded within the very long-wave Kondratiev wave (45-60 years), associated with technological revolutions like the Age of Steam or the Information Age. This hierarchy was notably explored by economists at the National Bureau of Economic Research.

Criticisms and empirical evidence

Criticisms of the concept question its regularity and deterministic nature. Scholars from the University of Chicago have argued that economic fluctuations are primarily random shocks, as seen in real business cycle theory, rather than predictable cycles. Empirical detection is complicated by major exogenous events like World War I, the Spanish flu, or the 1973 oil crisis, which can distort timing and amplitude. Statistical analyses, including spectral analysis and work by the International Monetary Fund, have found mixed evidence for strict periodicity. Nonetheless, the framework remains influential in the analysis of financial crises, such as the Great Depression and the 2008 financial crisis, and in the formulation of countercyclical policy by institutions like the European Central Bank. Category:Business cycles Category:Economic theories Category:Macroeconomics