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StockMarketAgent
Section 5 · as of 2026-05-09

Scenarios

Bear case first, in full. The bear case carries the largest non-base weight at 35% because the data has shifted: breadth is narrowing, earnings revisions turned negative, and the curve is steepening on real-rate stress rather than disinflation. The bull case is internally coherent but requires a coordinated revisions inflection that the data does not yet show.

Composite weighted fair value · S&P 500
4,959 vs spot 5,184

Three scenarios

Bear case

Probability 35% · fair value 4,480

Bear-led curve steepening continues; Q3 revisions deepen; mega-cap multiple compression triggers index drawdown to 4,300–4,600.

Drivers

  • 10y real yield breaks above 2.6% and stays there for two months.
  • Q3 cap-weighted earnings revision turns more negative; Industrials and Materials lead.
  • Mega-cap leadership cracks; equal-weight participation does not pick up the slack.
  • Credit spreads widen 50+ bps; HY OAS breaks 450 bps.

Kill switches

  • Fed signals a real-rate cap or curve-control posture.
  • Q3 revisions stabilise above flat by July.

Base case

Probability 45% · fair value 5,065

Sideways-with-downward-bias; index oscillates 4,900–5,250 as breadth churns; defensive sectors compound while leadership works through correction.

Drivers

  • Yield curve normalises slowly; long-end real rates plateau between 2.0% and 2.5%.
  • Earnings revisions stabilise but do not re-accelerate; growth is positive but unimpressive.
  • Defensive tilt (Healthcare, Staples, Utilities) compounds quietly while Technology corrects laterally.
  • Credit spreads stable; no stress event.

Kill switches

  • Either a coordinated earnings re-acceleration or a credit-stress shock would invalidate this base.

Bull case

Probability 20% · fair value 5,560

AI capex sustains a second leg of margin expansion; broad earnings revisions re-accelerate; index makes new highs through Q4.

Drivers

  • Q3 earnings revisions inflect positive on broad participation — not just five names.
  • Long-end real rates retrace below 2.0% on cooler inflation prints.
  • Breadth recovers: % above 200d MA returns above 60%; ad-line slope turns positive.
  • Hyperscaler capex translates to a measurable productivity-led margin uplift in non-tech sectors.

Kill switches

  • If breadth fails to broaden by mid-summer, the cap-weight rally is hollow and reverts to base.
The probabilities are editorial judgments, not Bayesian-updated posteriors. Readers are entitled to substitute their own weights; the scenario fair-values are the per-row anchor, the weights are the parameter to argue with. Cross-read the regime scorecard for the inputs that drove the weighting.