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...Operationsresearch informs vol no may june pp issn x eissn doi opre astochastic model for order book dynamics ramacont department of industrial engineering and operations research columbia university new york rama cont edu org sasha stoikov ms cornell financial manhattan author s or sashastoikov gmail com the inf rishi talreja to nals rt tesy we propose a continuous time stochastic limit strikes balance between three desirable features it can be estimated easily from data captures key empirical properties courhttp jour its analytical tractability allows fast computation various quantities interest without resorting at simulation describe simple parameter estimation procedure based on high frequency observations as le illustrate results tokyo stock exchange using matrix computations laplace transform y methods are able efciently compute probabilities events conditional state an ailab increase in midprice execution bid before ask quote moves both buy v sell best quotes price show that ou...