Add or subtract the rational expressions. Reduce the final answer. 
Definitions:
Bertrand Model
A model in economics that describes interactions in a market structure where firms compete on price.
Payoff Matrix
A table that shows the potential outcomes and payoffs for each combination of strategies between players in a strategic game.
Price Setting
The process of determining the selling price of a product or service, typically based on costs, market demand, and competition.
Marginal Cost
The increase in total cost that arises from producing one additional unit of a product or service.
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