I think hosting the Olympic games 2008 will have a positive effect on the Chinese economy.
First,there will be millions of foreigners come to China to see the Olympic Games,these foreginers will consume during their staying in China,for example,they eat foods in restaurants,live in hotels,they are like those travellers who visits China.
Second,the Olympic games creates more job opportunities for local workers.Olympic games ususlly requires a standard of the gymnasiums for the sport games,so there will be more building needed.
Third,the past data show most countries' economies improved after hosting an Olypmic games.