Writing a paper on entry exit models for cable companies

I am currently writing a paper on Entry/Exit models for cable companies. I need to create a short run profit model to calculate the cost of entry. The cost of entry is characterized by the ability of the market participant to pay down interest expense with free cash flows. The variables of entry costs will be financing costs, cost to build to customers and cost to service customers. The profit will be defined by estimated passings as a percent of revenue multiplied by revenue.