premise: BEIJING, Nov. 19 (Xinhua)-- The bidding for advertising on China Central Television (CCTV) in 2007 concluded on Saturday with the network's revenues hitting 6.79 billion yuan, up 16 percent over last year.
  Procter & Gamble, the world's consumer goods giant topped the bidding list for the fourth year running, at 420 million yuan, CCTV announced.
  The annual bidding has been hailed as the barometer of the country's economic performance.
  "Enterprises can foresee the economic trend in the coming year from the participating brands," said Yao Jingyuan, chief economist with the National Bureau of Statistics
  Olympic-related commercials notched up a combined value of 370 million yuan.
   What caused CCTV's revenues to hit 3.79 billion?
hypothesis: The bidding for advertising