suppose warner music and umg are in a duopoly and currently limit themselves to 10 new artists per year. each artist sells 2 million songs at $1.25 per song. however, each label is capable of signing 20 artists per year. if one label increases the number of artists to 20 and the other stays the same, the price per song drops to $0.75, and each artist sells 3 million songs. if both labels increase the number of artists to 20, the price per song drops to $0.30, and each artist sells 4 million songs.