This document discusses various methods for measuring and forecasting market demand, both current and future. It describes techniques like surveys of buyers and salespeople to estimate current demand. For future demand forecasting, it recommends analyzing past sales trends, conducting expert panels or surveys, and using quantitative approaches like regression analysis or expert opinions. The key is selecting the appropriate technique based on factors like available data, product type, and market characteristics. Accurately measuring demand is important for companies to effectively allocate resources and plan production levels.