 Furthermore, the trends in popular music indicate that the price of the average concert ticket increased by nearly 400% from 1981 to 2012, much faster than the 150% rise in overall consumer price inflation.Some scholars argue that superstardom plays a useful role in society.Caillois cites Rawls, who states that the "premiums earned by scarce natural talents serve to cover the costs of training and to encourage the efforts of learning, as well as to direct ability to where it best furthers the common interest".