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]
(..) Yeah, I hear that a lot. Listen, I know this must be a trying time for you, but we need to debrief you. There's still a lot of unanswered questions, and time can be a factor with these things. Let's just put something on the books. How about the th at p.m. at Stark Industries? Tell you what. (..)2008 Iron Man
(..) Kill power. Notes. Main transducer feels sluggish at plus altitude. Hull pressurization is problematic. I'm thinking icing is the probable factor. Connect to the sys. co. Have it reconfigure the shell metals. Use the gold titanium alloy from the seraphim tactical satellite. (..)2008 Iron Man