Cost was the 'decisive/deciding/determining factor' in their decision. [=the most important reason for their decision]
The 'deciding factor' was cost. [=the decision was based on cost; the least expensive option was chosen]
Costs increased/decreased by a 'factor' of 10. [=costs were 10 times higher/lower than they had been]
(..) Open it up. Read me something. Anything. "Civil liability associated with agency is based on several factors, including..." Including the deviation of the agent from his path, the reasonable inference of agency on behalf of the plaintiff, (..)2011 TvShow: Suits Title: Pilot Season: 1 Episode 1