Geopolitical questions get listed at several horizons at once: will this happen by June, by September, by December. Those are nested — anything that happens by June has also happened by December — so the prices must rise with the horizon. Long-dated legs are thin and stale while the near-dated one reprices on every headline, which regularly pushes the set into impossibility. You buy the underpriced longer horizon against the overpriced shorter one.
Markets on Polymarket where nested-deadline coherence arbitrage is the natural play: