Market demand is the total demand for a product from all consumers in the market at a given time. It is calculated by summing the individual demands from each consumer. Individual demand refers to the quantity demanded by a single consumer at different price levels. A demand curve can graphically show the relationship between price and quantity demanded in the market. Forecasting market demand involves determining the factors that influence demand, collecting relevant historical sales data, and using statistical techniques to predict future demand levels over different time periods. The objective, time horizon, data collection methods, and demand forecasting techniques should all be considered when developing a market demand forecast.