On opening day, Costco's first store on the Chinese mainland was forced to shut its doors early. The flood of customers led to the American shopping giant announcing that only 2,000 people were allowed to shop in the store at one time. Costco has been welcomed in Shanghai despite an intensifying trade war between the U.S. and China. The message is clear, quality products, attractive prices and branding are welcome among China’s ever-growing consumer market. Experts say whether Costco can succeed in the long term depends on how well it can adapt to China's dynamic retail landscape.