Studio System / Daily / Why

http://en.wikipedia.org/wiki/Studio_system
http://www.studiodaily.com/
https://www.studiobinder.com

Studios had come together to lower risks and, some years ago, a new cost-reduction strategy — where

1. writers, 
2. directors and 
3. actors 

joined hands as partners to share equal risk — was put in place.

http://www.filmstrategy.com/