here's the RIAA's claim about the music industry:
http://www.riaa.com/MD-Tracking.cfm
~$40B, them being 1/3rd of that.
take that with a grain of salt tho, they've been known to inflate their numbers a lot.
i'm reading that porn is around $10-15B.
http://www.ojr.org/ojr/business/1017866651.php
film is probably bigger than porn(waaay smaller than music) but not by much - the MPAA does an even better job of inflating their value in people's minds.
http://www.mpaa.org/useconomicreview...mic/sld001.htm
a piddly $8.4B in the box office. they make some money from rentals but it isn't clear from their site how much.
again keep in mind, they're also known to inflate their values.