Coca-Cola's friendly $2.5 billion bid to buy China's biggest juice maker is emerging as a test of whether Beijing will allow foreign companies to buy homegrown businesses - or force entrepreneurs to serve its vision of creating national economic champions. In this Aug. 11, 2008 file photo a vendor under a Coke umbrella rests on at the Mutianyu section of the Great Wall of China outside Beijing. Coca-Cola's friendly US$2.5 billion bid to buy China's biggest juice maker is emerging as a test of whether Beijing will allow foreign companies to buy homegrown businesses - or force entrepreneurs to serve its vision of creating national economic champions. ...