Why do airlines charge more to sit in the exit row?

Quite simply, exit row seats are much more comfortable in coach class than the other seats. On the majority of airlines, there are only two seats in the exit row compared to three everywhere else. In addition, there is a larger gap between the exit row seats and the seats in front of them, creating greater legroom. The combination of these factors has led to demand for the seats, which in turn has led some airlines to begin charging for them as they are an additional commodity.