NEW YORK (Reuters) - Republican frontrunner Donald Trump has upended the presidential primaries this year by relying heavily on free air time and Twitter at the expense of local-ad buying, throwing into question estimates that the November presidential election could translate into $6 billion spent on TV advertising.
Now, with no Trump TV ads scheduled going into the 11-state Super Tuesday primaries, some investors and analysts are growing increasingly concerned that Trump could continue with an advertising-light strategy built on bruising debate performances and large rallies - often shown on cable TV - even if he wins the Republican Party nomination.