I was wondering if you can help me with an economic analysis of two large competitor brands, Coke and Pepsi, in the context of them being rivals in

I was wondering if you can help me with an economic analysis of two large competitor brands, Coke and Pepsi, in the context of them being rivals in the "Twenty-First Century." It should not be a financial case.  It should be an economic case study, utilizing the economic model of pure competition, monopolistic competition, oligopoly or monopoly.