Business cycle
The business cycle is the recurring pattern of expansion and contraction in economic activity over time.
Capitalist economies do not advance steadily. They surge and stall in a recurring rhythm of boom and bust called the business cycle.
The business cycle is the recurring pattern of expansion and contraction in economic activity over time, the alternation of booms, when output and employment rise, and recessions, when they fall. It is one of the central features of market economies and a perennial preoccupation of policy.
The phases
A typical cycle moves through phases: expansion, when the economy grows and employment rises; a peak, when it reaches its high point and may overheat; contraction or recession, when activity declines; and a trough, the low point from which recovery begins. The phases are clearer in hindsight than in the moment, and cycles vary greatly in length and severity, which makes turning points notoriously hard to call in real time.
What drives the swings
Many forces interact to produce the cycle. Swings in confidence and expectations lead businesses and households to invest and spend more in good times and to retrench in bad, amplifying the movement. Credit expands in booms and contracts in busts. Shocks, to technology, oil prices, or finance, can tip the economy from one phase to another. Economists disagree about the relative weight of these causes, which is part of why the cycle remains imperfectly understood and imperfectly tamed.
Smoothing the cycle
Much of macroeconomic policy is an attempt to soften the cycle: to cool overheating booms before they end in painful busts, and to cushion recessions and speed recovery. Central banks adjust interest rates, and governments adjust spending and taxation, with this stabilising aim. Whether such fine-tuning genuinely smooths the cycle or sometimes adds to its swings is a long-running debate, but the ambition to dampen the extremes is at the heart of modern economic management.
The business cycle is a reminder that growth is not steady but punctuated, and that the path of an economy is a wave rather than a line. Understanding its rhythm, and the limits of our ability to control it, is fundamental to making sense of why good times and bad alternate as reliably as they do.