Price Elasticity is a day over day sensitivity view built from order book liquidity and quote derived closing prices. It compares daily order book totals with daily OHLC closes and computes percentage changes in total bids, total asks, and closing price across consecutive calendar days. The displayed lines are Demand Change and Supply Change, which correspond to the percentage change in bid side and ask side submitted liquidity, so the chart is best read as a view of changing demand and supply conditions rather than as a single elasticity coefficient.