“…Our work contributes to the broad literature on market segmentation, which includes (but is not limited to) studies on dark pools (e.g., Zhu (2014), Menkveld, Yueshen, and Zhu (2017)), access fees (e.g., Colliard and Foucault (2012), Malinova and Park (2015)), and broker order-routing decisions (e.g., Battalio, Corwin, and Jennings (2016), Cimon (2019)). Empirical work shows that fragmented markets improve liquidity (Foucault and Menkveld (2008)) and efficiency (O'Hara and Ye (2011)).…”