How does sector rotation work and what drives the timing of rotations?

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AcadiFi · Accepted Answer

Sector rotation is an active investment strategy that overweights or underweights sectors based on the expected phase of...

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**Classic business cycle / sector mapping:**

| Cycle Phase | Economic Conditions | Favored Sectors |
|---|---|---|
| Early Expansion | GDP rising, rates low | Consumer Discretionary, Financials, Industrials |
| Mid Expansion | Strong growth, rising profits | Technology, Materials, Industrials |
| Late Expansion | Inflation rising, rates increasing | Energy, Materials, Healthcare |
| Contraction | GDP falling, rates declining | Utilities, Consumer Staples, Healthcare |

**Timing signals:**

1. **Leading economic indicators** -- PMI, consumer confidence, housing starts, yield curve shape
2. **Monetary policy** -- Central bank rate decisions and forward guidance
3. **Credit conditions** -- Lending standards, credit spreads
4. **Earnings revisions** -- Sector-level analyst revision ratios
5. **Relative valuations** -- Sector P/E relative to its historical range

**Example -- Greystone Asset Management rotation decision (fictional):**

Greystone's macro model shows PMI peaked at 58 and is declining, the yield curve is flattening, and credit spreads are widening. This signals a late expansion moving toward contraction.

Portfolio shift: Reduce Technology and Consumer Discretionary from 30% to 18%. Increase Healthcare and Utilities from 15% to 27%.

**Challenges:** Timing is inherently difficult. The business cycle doesn't follow a fixed calendar, and transitions are only clear in hindsight. Many sector rotation strategies underperform after costs because they trade too frequently or misread the cycle turning points. Academic evidence suggests sector rotation adds value primarily through avoiding the worst-performing sectors rather than perfectly picking the best ones.

How does sector rotation work and what drives the timing of rotations?

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