Which Supreme Court justices will resign during Trump's term?

**Stage 1 — Blind analysis (ignore market price):**

Justice Clarence Thomas will be in his late 70s through the 2025–2029 term. Historically, Supreme Court justices retire for a small set of reasons: serious health decline, clear political calculus to time a successor, or reputational/ethical crises that make continued service untenable. Thomas has a long record of remaining on the bench through controversy, showing strong institutional inertia and personal reluctance to step aside. He is closely aligned with today’s conservative legal project, which reduces his incentive to retire while a Republican president who would likely name a similarly conservative successor is in office; in fact, for many ideologically conservative justices, the incentive to leave is sometimes lower when the Court’s ideological goals are still actively being advanced.

Quantitatively, using past retirements as a loose benchmark: among justices aged 75+ in the modern era, voluntary retirements still occur but are not the modal outcome within any fixed four-year window. Coupling that empirical tendency with Thomas’s history of staying through controversy, but also acknowledging increased odds due to his age and recurring reports of ethical scrutiny, I estimate a modest probability he resigns during a four-year Republican presidency. Balancing these forces, my independent (pre-market) probability for "Yes" is 22%.

**Stage 2 — Market calibration (compare to current price Yes=33% / No=67%):**

The market currently prices resignation at about 33%, which is materially higher than my 22% estimate. Possible reasons the market is pricing a higher probability:

- Traders may be overweighting the salience of past controversies and recurring reporting about undisclosed benefits; media salience tends to inflate perceived near-term resignation risk. - Liquidity and event-volume dynamics can make the market responsive to short-term rumor risk (e.g., a trader hedging exposure to other justices or to a broader Supreme Court slate), pushing the price up without new factual change. - Some participants may be using a simple heuristic (age > 75 + controversy => ~1/3 chance to retire in 4 years) that overstates actual likelihood given Thomas’s documented proclivity to remain.

Why I remain lower than the market:

- Empirical inertia: justices who have shown a pattern of staying through controversy are less likely to change behavior abruptly absent a major new shock. - Political incentive is actually mixed-to-negative for Thomas to resign during a Republican presidency because staying preserves his influence and avoids the unpredictability of internal Court dynamics.

That said, the market could be right if new negative revelations, a formal ethics investigation escalating to a clear impeachment threat, or sudden health deterioration occur. If traders are pricing in those tail risks at a higher rate than I am, that would justify a higher market probability.

Bottom line: I view the market as slightly overpricing the chance of resignation absent a new shock; I assign 22% independently, and would update materially only on substantive new developments (major health reports, formal investigations with strong evidence, or an explicit statement of intent to step down).