Consider Boeing and Airbus, practically the only producers of airplanes in the world. To be honest, they are not the only producers, but the two companies dominating the market for airline production with a combined 99% of the market. Further, the industry for airline manufacturing has very high fixed costs and substantial economies of scale, which means that it would be impractical for the industry to have several competitors. If the market demand is given by p(Y )=a-bY , where p is the price, and Y = y1 y2 is the market quantity. Also, yi represents the amount produced by each firm i for i = 1, 2 (Boeing and Airbus). The two firms have the same marginal cost equal to c. Note: for simplicity, you may feel free to let Boeing be firm 1 and Airbus be firm 2