This is meant to be an age of amazing potential for artists. Global streaming promised access to huge audiences and self-publishing the potential for personal control.

So why are artists earning less than they used to? And how have a smaller and smaller number of companies come to control the distribution of books, movies, and music?

Rebecca Giblin is a professor at Melbourne Law School and the Director of the Intellectual Property Research Institute of Australia.

Cory Doctorow is a best-selling author and activist

Together they're the authors of Chokepoint Capitalism, which looks at why these promises have never been realised, and what we can do to change the system.