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 iPod touch comes in three capacitiesâ8GB, 32GB, and 64GBâpriced respectively at $199, $299, and $399. These models, in ascending order, hold 1750 128-kbps AAC-encoded songs or 10 hours of video, 7000 songs or 40 hours of video, and 14,000 songs or 80 hours of video. While the iPod touch may not match the capacity of the iPod classic, a 64GB iPod touch that can hold 40 two-hour movies is nothing to sneeze at.