The economic cycle and sectors
Different sectors of the economy perform differently at different points in the economic cycle. Sector rotation is the movement of capital between these sectors as the macro environment shifts. Understanding which sectors lead and which lag in each cycle phase is a core macro toolkit.
In early expansion (after a recession trough): financials, consumer discretionary, and industrials tend to lead. Credit is loosening, consumers are spending again, and companies are investing. Technology often outperforms as risk appetite returns.
In late expansion (overheating, rising rates): energy and materials often perform as inflation picks up. Financials can remain strong. Consumer staples and utilities start to attract capital as investors become defensive. Growth stocks begin to underperform as rate expectations rise.
The S&P 500 sector ETFs make sector rotation trades accessible: XLF (financials), XLK (technology), XLE (energy), XLV (healthcare), XLU (utilities), XLP (consumer staples), XLY (consumer discretionary), XLB (materials), XLI (industrials), XLRE (real estate), XLC (communication services).
Defensive vs cyclical
Cyclical sectors (consumer discretionary, financials, industrials, materials, energy) move with the economy. When GDP is growing and employment is high, these sectors thrive. When the economy contracts, they suffer disproportionately.
Defensive sectors (utilities, consumer staples, healthcare) provide stable earnings regardless of economic conditions — people still need electricity, food, and medicine in a recession. Capital rotates into these during risk-off periods as investors seek income and stability.
The classic late-cycle trade: rotate out of high-beta cyclicals and growth, rotate into defensives, bonds, and gold. The opposite works at recession troughs: rotate from defensives into cyclicals as credit conditions ease and the economy begins recovering.
Relative strength as a sector tool
Monitoring relative strength between sectors (how each sector is performing versus the S&P 500) gives real-time information about where institutional capital is flowing. Sustained outperformance of defensives while the index is flat or rising is a warning signal for the broader market.
The sector momentum approach: buy the sectors showing the strongest 3-6 month relative strength and short (or avoid) the weakest. Academic research consistently shows sector momentum has meaningful predictive power — institutions move capital in trends, not one-day jumps.
Combining macro (which sectors should outperform given the economic environment?) with relative strength (which sectors are actually outperforming?) gives you a powerful filter. When macro expectation and market behavior agree, the signal is high confidence.