This document discusses different types of transactions in television media industries, specifically comparing direct and indirect transactions. It explains that historically there was a one-sided market with subsidy television, where the government provided direct subsidies to public television stations. However, the market has evolved to a two-sided model where television stations engage in indirect transactions, obtaining funding from both state subsidies and people's license fees as well as advertising revenue. The role of advertising in this new model is described, including how it aims to increase awareness, understanding, and purchase of products through communication with potential buyers.