What type of model would be best if we wanted to analyze the market for fast food? Why?

We know that the industry produces a differentiated product and is not characterized by a single seller; this rules out the models of pure competition and monopoly. There appears to be a large number of small sellers, so the competitive price-searcher model would be the best model candidate. There are a few large chains in the industry, such as McDonald's, but given the number of other national chains, regional chains, and local restaurants, this would imply both low barriers to entry and the inability of any firm to exert market power.