Implementing Arrow Debreu Equilibria By Continuous Trading of Few Long Lived Sec
Implementing Arrow Debreu Equilibria By Continuous Trading of Few Long Lived Sec
Darrell Duffie
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T)« That is, 6. E R represents the random variable which takes the real number 6. -, if branch 1 is the realized event at this node. Let p = (p^, . . . , p ) eR denote the vector of conditional branching probabilities at this node. The processes m, , . . • > hIm are then mutually orthogonal martingales if they satisfy the following two conditions at each node: (i) p^6. "=0, j = l, 2, . . . , N (zero mean jumps, the martingale property), and (ii) 5. [p](5, =0 Vj ^ k, where [p] denotes the diagon...al matrix whole 1-th diagonal element is p^ (mutually uncorrelated jumps, implying mutually orthogonal martingales). We construct the processes m, . . . , m^ by designing their jumps at each node of the event tree, in any order, taking m. (0) = ¥.. At a given node (with L branches), it is simple to choose non-zero -27- vectors &, ... , 6r_, in R satisfying Aj[p]6j = j = 1, . . . L - 1, (a. 4) where A. Is a i x L matrix whose first row is a vector of ones and J whose k-th row is iS _-■ . This cannot be done for j ^ L if 1/2 A, [p] is a full rank L x L matrix (its rows are non-zero and mutually orthogonal).
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