9% — Will Trump buy Greenland
Leader: Before January 20, 2029 at 9% · Kalshi 9% · 2 contracts · $69K volume · medium confidence
Updated 2026-09-20 20:47:26 UTC

Tracks the leading outcome in a winner-take-all prediction market set with 2 outcomes.

Why this matters:
This market reflects a 17% probability that the U.S. government will complete an acquisition of Greenland before January 20, 2029. The current level suggests traders view such a purchase as unlikely but not negligible given stated interest from the Trump administration. The probability would rise with explicit policy announcements, legislative action, or serious negotiations with Denmark; it would fall if officials distance themselves from the proposal or Denmark categorically rejects discussions. The most immediate catalyst is whether the administration pursues formal diplomatic channels or acquires political support in Congress—outcomes that could shift pricing substantially. A shorter-dated contract showing only 4% probability before 2027 indicates markets expect any purchase, if it occurs, to happen later in the presidential term. Resolution ultimately depends on whether actual negotiations materialize and, if so, whether they succeed.

Key factors:
- Trump administration officials have publicly discussed Greenland acquisition; market pricing reflects whether this remains rhetorical or translates into formal policy
- Denmark retains sovereignty and has stated opposition to selling; any purchase requires Danish government cooperation or extraordinary geopolitical circumstances
- No binding legal or constitutional mechanism exists for U.S. territorial acquisition from allies; legislative action would be required
- The 13-percentage-point spread between the 2027 and 2029 deadlines suggests most trader probability mass concentrates in years 2-3 of the term
- Historical precedent for major territorial acquisitions between developed allies is absent in modern era, constraining baseline expectations

Contracts:
- Will Trump buy Greenland?: Before January 20, 2029 — 9¢ Kalshi $13K (weight 19%)
- Will Trump buy Greenland?: Before 2027 — 3¢ Kalshi $56K (weight 81%)

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## Methodology

SimpleFunctions aggregates live YES-side prices from Kalshi and Polymarket contracts bound to this question. For binary topics the headline is the liquidity-weighted mid-price (weight = log(1 + 24h volume) × freshness, where freshness is 1.0 if updated <24h, 0.7 if <7d, 0.4 otherwise). For multi-outcome (winner-take-all) topics the headline is the current leader's price — disjoint outcomes are never arithmetically averaged. Snapshots refresh every 5 minutes during market hours.

## SF Signal

- SF Index, regime, and 30d Brier calibration are computed separately and surfaced at https://simplefunctions.dev/admin/calibration.
- No SimpleFunctions index / regime / calibration signal is bound to this topic yet — the headline above is market-derived only.

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*Last verified: 2026-09-20T20:20:51.999Z*

By SimpleFunctions — https://simplefunctions.dev/

Cite as: "9% per prediction markets (SimpleFunctions, September 2026)"
Canonical: https://simplefunctions.dev/answer/greenland
Full data: https://simplefunctions.dev/api/public/query?q=Will%20Trump%20buy%20Greenland
Provider: SimpleFunctions — https://simplefunctions.dev