When Rousseau wrote his social theory, concepts of liberty and freedom were not new ideas. Hints of social contract reasoning are found in earlier works, most notably in Book 2 of Plato's dialog The Republic, as well as, in Socrates.
The total spending per iTunes account is $43 per year across all media, says Dediu. At 575 million iTunes accounts, that works out to $24.7 billion of consumer spending at iTunes per year. The average iTunes account's annual spending on software has followed music's trend, falling to $9 from $42 in 2008. However, average annual spending on apps has gone in the opposite direction, rising to $16 this year from $7 in 2008.
What's notable first is that a 32GB iPod can hold about 8,000 songs. Therefore, it's somewhat ironic that the number of songs in the average TidySongs user's library matches so closely so Apple's most popular product. Second, it's hard to argue that the iTunes business model of $1 a song reflects reality.