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.
The article states that you can use iTunes Store credit from iTunes gift cards, but that you cannot use Apple Store credit, which is for buying Macs and other hardware etc. in the Apple Store.es you can use existing store credit before you sign up for account, but not actually during the checkout. At times thru the year apple will rune utunes $25-$50 gift cards on sale for 20% off. Usually when a new iPhone comes out. I just bought a $50 gift card for $40. Xmas I guess.