Any organization, industry sector, or government body needs to estimate demand for products or services. The estimation needs to be primarily done at the firm and industry level, as there might be many more models required within one firm to estimate demand. A finance team may use demand estimation models to assess its funding needs; an inventory management team may assess consumer demand and its current production levels to assess stock needs and plan production accordingly. At times, forecasting might happen at a macro level, for example involving the economy, market sizing, and so on. A company planning to diversify into a new sector will want to know what the current market demand is, how much is it expected to grow by, and what proportion of this market can be captured as a new entrant in what might be a crowded marketplace of established players. Demand planning helps with all of these scenarios.