“…Recall that the optimal execution problem is to slice big orders into smaller ones on a daily/weekly basis in order to minimize the price impact or to maximize some expected utility function; see for instance, Bertsima and Lo (1998) [10], Almgren andChriss (1999, 2000) [5,6], Almgren (2003) [4], Almgren and Lorenz(2007) [7], Schied and Schöneborn (2009) [47], Weiss (2009) [50], Alfonsi, Fruth, and Schied (2010) [1], Gatheral (2010) [24], Predoiu, Shaiket, and Shreve (2010) [43], Schied, Schöneborn, and Tehranchi (2010) [48], and Alfonsi, Schied, and Slynko (2012) [2], Gatheral and Schied (2011) [25], Forsyth, Kennedy, Tse, and Windcliff (2011) [23], and Guo and Zervos (2012) [30], and Obizhaeva and Wang (2013) [42]. Optimal placement problem, on the other hand, is on a smaller (10-100 seconds) time scale and mostly for different type of (i.e., HFT) traders (see Kirilenko et.…”