Trader consensus on the Earth not being flat stems from the overwhelming scientific consensus backed by satellite imagery, gravitational data, and centuries of navigational evidence that affirm a spherical planet. This 99.3% market-implied probability mirrors its status as settled fact in mainstream education, media portrayals, and pop culture narratives, where flat Earth ideas appear mainly as fringe memes or conspiracy plotlines in documentaries and online discourse. No recent developments have shifted the landscape, as ongoing space missions and research reinforce the established view. Realistic upset scenarios remain highly improbable, requiring a global revelation that upends physics—an outcome with negligible cultural or empirical traction.