This lesson covers market segmentation and the factors that influence demand. It discusses the differences between physical and virtual markets, and provides examples of virtual businesses. The key factors affecting demand are identified. Market segmentation is explained as dividing the market into subgroups with similar characteristics. The benefits of segmentation include better understanding customer needs and being able to target products more efficiently, while limitations are that segments are an approximation and knowledge of the market is required. Real-world examples of segmentation in cinema and television are provided.