... ad spending in the U.S. will grow just 2.5 percent next year to $155 billion, and a total of just under 9 percent between 2010 and 2013 to $164.8 billion, an increase that the agency termed “disappointing.” The Olympic-Election year of 2012 will see growth of just 3 percent to $159.6 billion.
Global growth will be a bit better, with Brazil, China and India expected to lead, and China surpassing Japan to become the second-biggest ad market.
The hold-up in the US?: "... corporate concerns about debt, unemployment and government spending."