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.
Since my wife and I enjoy listening to music often, we used to spend a good amount of money on CDs and mp3 downloads. While these run between $.99 and $1.29, Spotify has a one time monthly fee of $9.99. This means if I purchase between 7 and 10 new songs a month, Spotifyâs paid for itself.