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STOCHASTIC

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MINIMAX POLICIES FOR SELLING AN ASSET AND DOLLAR AVERAGING 385<br />

through t and the price at time t (i.e., re, = p* — p,). Using this notation, the maximum<br />

price pT* can be written as in (8)<br />

(8) v* = V * + Max [0, -re, + £{+, APi (t + 1 S i S T)].<br />

Subtracting (2) from (8) gives the regret in (9):<br />

(9)<br />

R = p* — Pa — Si ApiZi<br />

+ Max [0, - n, + S'+i Aft (( + 1 g t g D] - S^+i Ap

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