Equity Sector Rotation

THE ELEVEN GICS SECTORS are the backbone. The Global Industry Classification Standard assigns each company one primary classification by principal business activity, maintained by a standard-setter and used across the industry - which is what makes sector comparison meaningful in equities and impossible in the same form in crypto. Standardised GICS-based sector indices and ETFs make sector returns consistently observable - though still dependent on index construction, eligibility and weighting rules, and in an ETF's case on fees and tracking error.

THE CYCLICAL LOGIC. Sectors have different sensitivities to growth, rates and inflation, so they lead and lag through an economic cycle: cyclicals - consumer discretionary, industrials, financials, materials - are more sensitive to growth, while defensives - utilities, staples, healthcare - have demand that holds up in a downturn. Rotation between them is the visible expression of changing expectations. A caveat comes with it: the cycle-to-sector mapping is a widely used heuristic supported by broad patterns rather than a reliable timing rule, and rotations are usually clear only afterwards.

WHY DEFENSIVES ARE NOT SAFE, only less cyclical. A defensive sector still carries market risk and its own rate sensitivity - utilities in particular are long-duration and rate-sensitive, so they can fall in exactly the risk-off environment that is supposed to favour them.

SECTOR VALUATION AND MARGIN BASELINES are what separate this from a pure momentum read. Ranking by recent return alone finds what has gone up; comparing against a sector's own valuation and margin history asks whether the move has fundamental support. Both are needed - price without fundamentals is momentum, fundamentals without price ignores what the market has already done.

THE WINDOWS ARE SHORT. One week and one month, against an economic cycle measured in quarters and years. A week of sector returns is dominated by noise and by whatever moved the whole market, so a 'rotation' at that horizon may be nothing of the sort. The two windows disagreeing is common and is not itself a signal.

A MEASUREMENT NOTE: sector RELATIVE strength - each sector against the broad market - is the right comparison, since raw returns in a rising market show every sector positive and rank them by beta as much as by rotation.

AND THE PROVENANCE POINT WORTH KNOWING. This analysis SKIPS when no sector price data is available, rather than describing the current regime from recalled knowledge. A macro regime read from a model's memory is a snapshot of its training cutoff, and market leadership rotates continuously - so refusing to answer without live prices is the correct behaviour, and a skip here is a strength rather than a gap.