A live 2D warehouse-network simulator that puts the central trade-off of supply-chain design under your control: should each region hold its own inventory buffer, or should everyone draw from one consolidated distribution center? Each period, every site draws a random demand from a Normal distribution, bar-chart stock levels rise and fall in real time, and a base-stock replenishment policy tops each one back up to a target that includes a safety-stock buffer sized from your chosen service level. A scrolling history chart tracks total system stock and stockout events over time, and a distribution panel overlays the single-site and pooled demand bell curves so you can see, not just read, why the square-root law works. Toggling to Pooled mode merges the independent demand streams into a single buffer and applies the square-root-law formula, so you can watch the total safety stock — and the stockout rate — respond exactly as inventory theory predicts.