U.S. ad spending growth slowing down: Ad spending in the U.S. increased 1.5% in the first nine months of the year compared with the year-earlier period, according to data released by Kantar Media. Growth in spending is slowing, the company said. “From +4.1% in the first quarter, to +2.8% in the second quarter and now a barely palpable +0.4% for the July to September period.”