In Rolling Stone magazine, several fans and rock stars, including Pearl Jam, were bemoaning the high price of concert tickets. One superstar argued, 'It just isn't worth $75 to see me play. No one should have to pay that much to go to a concert.' Assume this star sold out arenas around the country at an average ticket price of $75.
a. Based solely on demand and supply, the fact that the arenas sell out around the country suggests that the price of $75 is?