> Ovidiu Racorean. "Crossing stocks and the positive Grassmannian I: The Geometry behind Stock Market." ([arXiv Abstract link][1]) Anyone care to offer a summary of what's going on here? (The situation is reminiscent of "[The amplituhedron minus the physics][2]"...) <br /> ![Fig11][3]<br /> [1]: http://arxiv.org/abs/1402.1281 [2]: https://mathoverflow.net/q/142841/6094 [3]: https://i.sstatic.net/lUmVy.png