Computer-implemented systems and methods are provided for delivering products according to propagated changes in a demand planning hierarchy. Demand planning data is received in addition to a change to the product quantity or a disaggregation factor at a node of the hierarchy. The product quantity is updated at other nodes based upon the received change. Updating the product quantity at other nodes includes solving a set of simultaneous equations to generate an updated demand planning hierarchy. The simultaneous equations include a sum of the product quantity at a node and a augmenting flow at the node equals a sum of the product quantities of children nodes of the nodes and a relieving flow at the node, and disaggregation factors at the node and other nodes are implemented. Solving the set of simultaneous equations includes minimizing the sum of the augmenting flows of the node and other nodes.