What Prediction Markets Are Forecasting

Prediction markets currently give about a 1 in 8 chance that the Supreme Court will agree to hear a case centered on the Third Amendment before January 2029. In simpler terms, traders collectively see this as very unlikely, but not completely impossible. This low probability reflects a strong consensus that the Court’s agenda will not include this particular constitutional issue in the near future.

Why the Market Sees It This Way

The Third Amendment restricts the quartering of soldiers in private homes without the owner's consent. It is the least litigated part of the Bill of Rights. There has never been a Supreme Court ruling that directly interprets it, and lower courts have only addressed it a handful of times in modern history.

Two main reasons explain the low odds. First, the amendment addresses a very specific historical grievance that rarely creates a modern legal dispute. Contemporary cases that mention it often do so alongside other claims, and courts typically resolve them on other grounds. Second, the Supreme Court accepts only about 1-2% of the thousands of petitions it receives each term. It prioritizes cases with broad national impact, recurring legal splits, or urgent constitutional questions. A pure Third Amendment case is seen as lacking that scale or urgency, making it a low priority for the justices.

Key Dates and Events to Watch

The Supreme Court’s term runs from October to June. The key dates are the periodic conferences where justices privately review petitions and decide which to accept. These happen year-round, but a cluster of grants typically occurs in January for the following term.

Watch for any unusual petition that manages to frame a Third Amendment issue in a novel, compelling way that touches on modern privacy or property rights. A signal would be significant attention from legal scholars or media to a lower court ruling on the amendment. However, the most likely event is simply the continued passage of time without any such case being accepted.

How Reliable Are These Predictions?

Markets are generally reliable at forecasting low-probability, niche legal events like this one. Their accuracy comes from aggregating many opinions, including those of legally-informed traders. When an outcome is perceived as extremely rare and the system has strong inertia—as with the Supreme Court’s case selection habits—market odds tend to be stable and correct.

The main limitation is the “black swan” scenario: an unpredictable, bizarre case that suddenly makes the amendment relevant. But markets account for this by not pricing the probability at absolute zero. The current 13% chance essentially represents the small possibility of a legal surprise.