The potential market size for this case is determined by calculating the revenue per flight based on the price elasticity diagram. It's said that because the potential per flight is the highest at $15, the market size is $15 * 99m (potential users) * 20% (users that will buy at $15) = $297m. However, if we price it at $15 shouldn't we be able to grab the willigness to pay of those that would pay more than $15? Meaning our potential market size would be 99m (potential users) * (20% (WtP = $15) + 10% (WtP = $20) + 5% (WtP = $25)) * $15 = $520m.
Did I misunderstood something or is there a mistake in the solution?