I have been a bit of a movie buff lately, and I have noticed the same phrase in several movies I have been watching lately (with some minor variation):
"It's just [good] business"
This has occurred in multiple movies, which to my knowledge are completely unrelated, such as "Lego Movie", "Monsters vs. Aliens", "Pirates of the Carribean: Dead Man's Chest"* and "Pirates of the Carribean: at World's End"*, as well of a few others.
So where does the phrase come from?
*these are related (clearly), they are just a repeat by the same character in two parts of the same series.