Could you tell me how to abbreviate few-word phrases as in the use of "mobile" for "the mobile business" in the sentence
"Company A's lagging position in mobile is the most pressing challenge?"
When I come across such an abbreviation, I wonder why it should be "mobile," but not "mobiles" nor "the mobile" (shorthand for the mobile business).
I would like to know the rationale behind this particular type of abbreviation.