The size and location of the market would primarily fall under Market Research. Market research involves gathering data about the market in which a business operates, including the size of the market, demographic details, geographic locations, and market trends. This type of research is essential for understanding the potential demand for products or services, identifying target audiences, and making informed business decisions.
Additionally, while advertising research focuses on the effectiveness of marketing campaigns, sales research concentrates on sales performance and strategies, and product research deals with product development and improvement, the aspects of size and location align most closely with market research.