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.
Here's why not: $4.99 per month is a lot of money to ask for music when iTunes radio, iHeart radio and a bazillion other apps provide similar experiences for free. Now I'd happily pay $4.99 per month for Pandora One if there were no commercials, no interruptions and unlimited skips. But asking me to pay $60/year and still expecting me to accept interruptions and limited skips per day? Not worth it to me ... or a lot of other people, apparently.