US presidential candidates George Bush and John Kerry have spent a total of $300m (£164m) on their ad campaigns. Their commercials have been screened more than 350,000 times.
DaimlerChrysler and Nissan Motors raised their expenditure by 56% to $887m and 21% to $545m respectively. Household goods giant Procter & Gamble, owner of Pampers and Flash, was the biggest spender, increasing its adspend by 11% to $1.5bn.
Media spending on local magazines increased by 12.7%, cable television was up 12.5% and network television showed a 7.5% rise.
Radio adspend grew by 3% and newspaper expendure rose by 2.7%.
The top 10 US advertisers have spent $8bn on advertising so far this year, an 11.3% increase on the same period last year.
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