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.
Like Spotify, Apple Music offers two usage tiers - paying for a monthly subscription or free. To entice people into trying it out, Apple is offering a three-month free trial, after which they will be charged $9.99 a month. UK pricing is still set to be announced, but it's highly likely it'll be Â£9.99.