Predictive Purchasing is a tool in Sellercloud that uses your Sellercloud data to recommend a quantity to purchase. It predicts a number of sales you will have over the next coming days. Projection is based on a number of factors, including the number of past sales and the available quantity. Past sales are used to determine a velocity, or the rate of sales per day over a given date range. Velocity is then multiplied to calculate the deficit supply for multiple date ranges. The data that is generated is not real-time data and is actually generated at night. Therefore, any changes made during the day will not be reflected in the predictive purchasing.