What is the primary reason that companies give away content for free

Copyright law protects the expression of an idea so blank is protected by copyright

In the supply-and-demand schedule shown above, at the lowest price of $50, producers supply music players and consumers demand music players.

The lee family is looking to buy a house in one of two suburban areas just outside of a major city, and air quality is a top priority for them. overall air quality is calculated by taking measures in 100 locations within each suburb and then calculating a measure of central tendency. in one suburb, there is a major bus station that creates very poor air quality at its location but has no impact in the surrounding parts of the suburb. in this situation, which measure of overall suburb air quality would be most useful?