Sector Rotation: The Model, the Chart and How to Trade It

Sector rotation is the movement of money from one group of stocks to another as the economy and the market cycle progress. The model behind it is simple: some industries tend to do best when the economy is coming out of a slump, others when it is running hot, and others when it is slowing down. A trader who knows which sectors usually lead in each phase has a map of where strength might move next.

The classic sector rotation model

One version, from StockCharts ChartSchool, is drawn above. It has one starting point that surprises beginners: the stock market turns before the economy does. Stocks anticipate, so the sector leadership described below can show up before the economic data confirms the phase (ChartSchool). The page gives no fixed lag, and it says its cycle map is based on one shown in the Intermarket Review by Martin J. Pring.

• Near the market bottom: "The technology sector is the first to turn up in anticipation of a bottom in the economy," with consumer discretionary "not far behind".
• Near the market top: "The top of the market cycle is marked by relative strength in materials and energy."
• At the tipping point: the turn comes when "leadership shifts from energy to consumer staples", a defensive group whose sales hold up in a slowdown.
• During the downturn: "Falling interest rates benefit debt-laden utilities and business at banks", so utilities and financials tend to hold up as the economy weakens and rates are cut.

ChartSchool also frames the underlying business cycle as an ideal case: it describes "the ideal business cycle in an inflationary environment", in which stocks and bonds rise and fall together, and notes that in a deflationary environment "bonds and stocks would move in opposite directions." The sector order is a model built on that ideal cycle, not a fixed sequence.

The four phases of the business cycle and their leading sectors

Fidelity's business cycle approach splits the economy into four phases, which it calls beginning the cycle, moving through the cycle, toward the end, and heading into recession, and describes the sectors that have historically done best in each (Fidelity). The table summarizes that page in our words. It does not match the ChartSchool model exactly, which is itself a lesson: sector rotation is a set of tendencies, not a law.

Fidelity's own warning applies to the whole table: "Past performance is no guarantee of future results." The move toward recession is also what an inverted Treasury curve is watched for; the dynamic yield curve page dates each long inversion since 1990 and what followed.

The 11 sectors

This page uses the Global Industry Classification Standard (GICS), developed by MSCI and S&P Dow Jones Indices, which splits the market into 11 sectors (MSCI):

• Cyclical, sensitive to growth: Consumer Discretionary, Information Technology, Communication Services, Industrials, Materials, Energy, Financials, Real Estate.
• Defensive, steadier demand: Consumer Staples, Health Care, Utilities.

The split into cyclical and defensive is a common reading of how each sector's sales respond to the economy, not part of the GICS standard itself.

How to read sector rotation on a chart

Rotation is about relative performance: a sector can fall and still lead if it falls less than the market. Two tools make that visible.

Relative strength lines

Divide the price of a sector index or sector fund by the price of a broad index such as the S&P 500. A rising ratio means the sector is outperforming; a falling one means it lags. Trend lines and moving averages work on that ratio as they do on a price chart, which is where the reading of bullish and bearish trends applies.

Relative Rotation Graphs (RRG)

RRG charts, developed by Julius de Kempenaer in 2004 and 2005, plot each sector on two axes: JdK RS-Ratio (the trend of relative strength, horizontal) and JdK RS-Momentum (its rate of change, vertical). That gives four quadrants, leading, weakening, lagging and improving, and in the idealized case sectors rotate through them clockwise (ChartSchool on RRG).

Both axes are normalized so that 100 is the dividing line: an RS-Ratio above 100 means the sector is in a relative uptrend against the benchmark, below 100 in a relative downtrend, and the further from 100, the stronger the trend. Each sector is drawn with a trail of its recent positions, so you see the direction it is moving and not only where it is. An RRG is the closest thing to a live "sector rotation map": it shows where each sector sits now, not where a textbook says it should be.

A sector rotation strategy, step by step

1. Place the market in its cycle. Use the trend of a broad index and the phase checklist from the guide to market cycles.
2. Rank the sectors by relative strength over a fixed window that you choose in advance, and check the ranking against the model. Agreement is a stronger signal than either alone.
3. Trade the leaders, not the forecasts. Buy sectors whose relative strength line is rising; avoid or reduce those whose line is falling.
4. Set the review date and the exit rule in advance, for example a relative strength line that breaks its trend.
5. Size every position so that a wrong call costs a fixed, small share of the account.

What triggers sector rotation

Rotation follows the drivers of the business cycle: interest rates, inflation, earnings expectations and credit. Falling rates help rate-sensitive sectors such as utilities and financials, rising commodity prices help energy and materials, and a recovering consumer helps discretionary spending. Because investors act on expectations, the rotation shows up in prices before it shows up in reported earnings.

Limits of sector rotation

• The models are idealized. ChartSchool and Fidelity disagree on where financials lead, and both say real cycles vary.
• The environment matters. The business cycle behind the model is described as the ideal case in an inflationary environment; in deflation, stocks and bonds stop moving together, so the cycle can look different.
• Phases are known late. Recessions are dated after the fact, so rotation based on economic data alone arrives late; that is why relative strength comes first in the steps above.
• Sector definitions change. Index providers revise their classifications over time, so long histories of a sector are not always comparable.

Sector rotation is one of the core ideas in the trading concepts section. For the long-term view of how a primary trend unfolds, see the Dow theory guide.