Economic Cycle

The National Bureau of Economic Research, a private non-profit research organisation, is the official arbiter of United States business cycle chronology, identifying the dates of peaks and troughs and thereby defining the beginning and end of each recession and expansion.

The Four Phases

The expansion phase is the normal state of the economy, as the NBER itself confirms — recessions are the exception. 

During expansion, real gross domestic product grows, employment rises, consumer spending increases, business investment accelerates, corporate profits expand, and credit conditions ease. 

Interest rates typically begin an expansion at low levels, stimulating borrowing and investment, and tend to rise as the expansion matures and the Federal Reserve responds to increasing inflationary pressure.

The peak is the month in which economic activity reaches its cyclical high before declining. By NBER convention, the peak month is classified as the last month of the expansion rather than the first month of the recession. Peaks are identified retrospectively — the NBER's Business Cycle Dating Committee does not declare a peak in real time but only after sufficient data has accumulated to confirm that activity has turned. This retrospective identification means that market participants rarely know with certainty that a peak has occurred until months after the fact.

The contraction phase — called a recession when it meets the NBER's criteria — is the period from peak to trough during which economic activity declines. The NBER defines a recession as a significant decline in economic activity that is spread across the economy and lasts more than a few months, normally visible in real GDP, real income, employment, industrial production, and wholesale and retail sales. The popular definition of a recession as two consecutive quarters of negative real GDP growth — attributed to economist Julius Shiskin and widely reported in financial media — is explicitly rejected by the NBER, which uses the broader multi-indicator definition. The COVID-19 recession of 2020 lasted only two months by NBER dating — February to April 2020 — and would not have qualified under the two-quarter popular definition despite being the sharpest economic contraction since the Great Depression.

The trough is the month in which economic activity reaches its cyclical low before recovery begins. By NBER convention, the trough month is classified as the last month of the recession. Recovery — the period from trough back to the prior peak level of activity — is technically part of the subsequent expansion phase rather than a separate phase in NBER terminology, though investment practitioners commonly treat early-cycle recovery as a distinct investment environment.

Duration and Historical Record

Post-World War II United States expansions have averaged approximately sixty-four months in duration while contractions have averaged approximately ten months, confirming the NBER's characterisation of expansion as the normal state and contraction as the exception. The longest expansion in United States history ran from June 2009 to February 2020 — one hundred and twenty-eight months — following the Great Recession. The shortest post-war recession was the two-month COVID-19 contraction of 2020. The longest post-war recession was the Great Recession of December 2007 to June 2009, lasting eighteen months.

The NBER measures business cycles both peak to peak and trough to trough, examining the full cycle in both directions. The Committee examines a range of monthly indicators including real personal income less transfer payments, nonfarm payroll employment, real personal consumption expenditures, wholesale and retail sales adjusted for price changes, and industrial production. The Committee states it watches payroll employment statistics particularly closely because employment data are available monthly with modest revision lags and directly measure labour market conditions.

Leading, Lagging, and Coincident Indicators

Economists classify economic indicators by their timing relationship to business cycle turning points — whether they move before, during, or after changes in aggregate economic activity. This classification directly affects their usefulness for forecasting versus confirming the cycle's current phase, and appears throughout the Series 65 examination curriculum.

Leading indicators move before the economy as a whole, making them useful for anticipating turning points. The Conference Board publishes the Leading Economic Index, a composite of ten leading indicators including average weekly manufacturing hours, initial unemployment insurance claims, manufacturers' new orders for consumer goods, the ISM new orders index, building permits for new private housing units, the S&P 500 index, the Leading Credit Index, the interest rate spread between ten-year Treasury bonds and the federal funds rate, average consumer expectations for business conditions, and the index of leading credit conditions. The equity market's classification as a leading indicator reflects the observation — confirmed by the Ryan OConnell CFA analysis of the Great Recession — that the S&P 500 peaked in October 2007, two months before the NBER-dated cycle peak of December 2007.

Coincident indicators move in step with the overall economy and are most useful for confirming the current phase of the cycle. The Conference Board's Coincident Economic Index comprises four indicators: employees on non-agricultural payrolls, personal income less transfer payments, industrial production, and manufacturing and trade sales. These four indicators are nearly identical to the data series the NBER's Business Cycle Dating Committee monitors most closely, making the Coincident Index a real-time proxy for the NBER's assessment of current economic conditions.

Lagging indicators move after the economy has already turned, providing confirmation of turning points that have already occurred rather than advance warning. The unemployment rate is the most widely discussed lagging indicator — as the Great Recession illustrated, nonfarm payroll employment did not return to its pre-recession peak until May 2014, nearly five years after the June 2009 trough, while the economy had been officially expanding throughout that period. The average duration of unemployment, the ratio of consumer credit to personal income, and the prime rate charged by banks are among the other widely monitored lagging indicators.

Investment Implications Across the Cycle

The four phases of the economic cycle create systematically different investment environments, and understanding how different asset classes and sectors perform through the cycle is central to the portfolio management and asset allocation concepts tested on the Series 65 examination.

During expansion, corporate earnings grow as revenue rises and operating leverage amplifies profit margins. Equity markets tend to perform strongly, cyclical sectors — consumer discretionary, industrials, materials, energy, and financials — typically outperform defensive sectors, and credit spreads tighten as default risk falls. Interest rates tend to rise as the Federal Reserve responds to inflationary pressure, which creates headwinds for long-duration fixed income.

As the economy approaches a peak and monetary policy tightens, growth momentum slows, yield curves flatten or invert, and investors begin rotating from cyclical toward defensive sectors — consumer staples, healthcare, and utilities — whose earnings are relatively insensitive to economic conditions. 

The equity market often peaks before the NBER-dated economic peak, as investors anticipate the coming contraction and discount future earnings at higher rates reflecting tightening financial conditions.

During contraction, corporate earnings fall, credit spreads widen, and equity prices decline. 

High-quality long-duration Treasury securities typically appreciate as investors seek safety and as the Federal Reserve begins cutting interest rates in response to the economic weakness. High-yield bonds suffer as default rates rise. 

The dollar often appreciates in deep global recessions as international investors move to dollar-denominated safe assets.

At the trough and in early recovery, equity markets typically begin rising well before the economic data confirm that the recession has ended, because equity prices are forward-looking and discount the anticipated recovery in earnings before it appears in the data. Interest rates remain low, stimulating borrowing and investment. Credit spreads begin tightening. The most interest-rate-sensitive and credit-sensitive sectors — financials, real estate, and cyclicals — often lead the early-cycle recovery in equity markets.

Federal Reserve Policy Through the Cycle

The Federal Reserve's monetary policy response to the economic cycle is a critical mechanism connecting macroeconomic conditions to financial market outcomes and is tested extensively in securities licensing examinations.

During expansion, as labour markets tighten and inflationary pressure builds, the Federal Reserve raises the federal funds rate target to slow demand growth and prevent inflation from becoming entrenched. Rising short-term rates increase the cost of borrowing for businesses and consumers, slowing credit-financed spending and investment. The Federal Reserve's preferred inflation measure is the Personal Consumption Expenditures price index, and it calibrates its tightening cycle to return PCE inflation toward its two percent target.

When the economy enters contraction, the Federal Reserve reduces the federal funds rate to stimulate borrowing, investment, and consumption. In severe contractions where the federal funds rate reaches the zero lower bound — as in 2008 and 2020 — the Federal Reserve deploys unconventional tools including quantitative easing, forward guidance on the future path of rates, and emergency lending facilities to provide additional monetary stimulus beyond what conventional rate cuts can deliver.

Examination Relevance and Key Takeaways

The economic cycle is tested on the SIE and Series 65 examinations in the context of macroeconomic analysis, leading and lagging indicators, Federal Reserve monetary policy, and the investment implications of different cycle phases.

The core points to retain are these: the economic cycle moves through four phases — expansion, peak, contraction, and trough — with expansion as the normal state and contraction as the exception; the National Bureau of Economic Research is the official arbiter of United States business cycle dating, using a multi-indicator definition of recession requiring a significant, widespread, and lasting decline in economic activity rather than the popular but unofficial two-consecutive-quarters-of-negative-GDP definition; leading indicators including the equity market, building permits, and the yield curve spread move before the economy and are useful for anticipating turning points; coincident indicators including payroll employment, industrial production, and personal income move with the economy confirming its current phase; lagging indicators including the unemployment rate move after the economy has turned and confirm that a phase change has already occurred; post-World War II expansions have averaged approximately sixty-four months while contractions have averaged approximately ten months; and the Federal Reserve raises the federal funds rate during expansion to contain inflation and reduces it during contraction to stimulate growth, with unconventional tools including quantitative easing deployed when conventional rate cuts reach the zero lower bound.