Shopping Cart Analysis , Time Series (seasonality & cyclic trends) and Historical Sales can provide great statistical indicators to predict future demand.
Retailers suggest items to purchase next to up sell and cross sell based on their consumers purchasing history. Business forecast demand of items to plan and prepare for supply chain . Sales trends of certain items are often seasonal & cyclic. It influences successful Promotions & Rebates campaigns. Visualize these forecasting techniques with degree of confidence in their predictions