A binary tree structure for detecting inventory problems. A first embodiment detects on-hand inventory problems. A second embodiment detects inventory requirements problems. Both embodiments use a binary tree whose nodes store time values and delta values. (FIG. 2). The delta values represent inventory consumers or producers. (FIG. 6). The time values of trees used for inventory requirements problems are shifted in accordance with build-ahead times. (FIG. 6).

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